Unsolicited warnings related to Intel compilers

I observe unsolicited warnings related to Intel compilers even though I don't specify anything like `%intel` on the command line.

### Steps to reproduce the issue

<details>
<summary>
<code>spack solve</code>
</summary>

```
==> Warning: Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
==> Best of 1 considered solutions.
==> Optimization Criteria:
 Priority Criterion Value
 1 version weight 0
 2 number of non-default variants (roots) 0
 3 multi-valued variants + preferred providers for roots 0
 4 number of non-default variants (non-roots) 0
 5 number of non-default providers (non-roots) 0
 6 count of non-root multi-valued variants 0
 7 compiler matches + number of nodes 0
 8 version badness 0
 9 non-preferred compilers 0
 10 target matches 0
 11 non-preferred targets 0
```
</details>

### Error Message



<details>
<summary>
<code>spack --debug --stacktrace solve</code>
</summary>

```
lib/spack/spack/util/executable.py:182 ==> [2021-04-05-14:22:59.744364] '/bin/bash' '--norc' '--noprofile' '-lc' 'echo $CRAY_CPU_TARGET'
lib/spack/spack/platforms/cray.py:154 ==> [2021-04-05-14:22:59.763458] default to front-end architecture
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-14:23:00.906830] Imported solve from built-in commands
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-14:23:00.909005] Imported solve from built-in commands
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:01.219739] Reading config file /dev/shm/spack/test/etc/spack/compilers.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:03.008165] Reading config file /dev/shm/spack/test/etc/spack/defaults/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:03.080323] Reading config file /dev/shm/spack/test/etc/spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:03.090397] Reading config file /u/staff/mbelkin/.spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:03.139487] Reading config file /dev/shm/spack/test/etc/spack/defaults/packages.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:03.249287] Reading config file /dev/shm/spack/test/etc/spack/packages.yaml
dev/shm/spack/test/lib/spack/spack/main.py:431 ==> [2021-04-05-14:23:04.206624] Warning: Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:04.937888] Reading config file /dev/shm/spack/test/etc/spack/defaults/repos.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-14:23:04.944837] Reading config file /dev/shm/spack/test/etc/spack/repos.yaml
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.083208] opt_criterion(15, version weight)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.083743] opt_criterion(14, number of non-default variants (roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.084143] opt_criterion(13, multi-valued variants + preferred providers for roots)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.084539] opt_criterion(11, number of non-default variants (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.084935] opt_criterion(9, number of non-default providers (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.085343] opt_criterion(8, count of non-root multi-valued variants)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.085914] opt_criterion(7, compiler matches + number of nodes)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.086292] opt_criterion(6, version badness)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.086648] opt_criterion(5, non-preferred compilers)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.087000] opt_criterion(4, target matches)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-14:23:06.087361] opt_criterion(3, non-preferred targets)
lib/spack/spack/cmd/solve.py:123 ==> [2021-04-05-14:23:06.099240] Best of 1 considered solutions.
lib/spack/spack/cmd/solve.py:124 ==> [2021-04-05-14:23:06.099658] Optimization Criteria:
 Priority Criterion Value
 1 version weight 0
 2 number of non-default variants (roots) 0
 3 multi-valued variants + preferred providers for roots 0
 4 number of non-default variants (non-roots) 0
 5 number of non-default providers (non-roots) 0
 6 count of non-root multi-valued variants 0
 7 compiler matches + number of nodes 0
 8 version badness 0
 9 non-preferred compilers 0
 10 target matches 0
 11 non-preferred targets 0

```
</details>

When I comment out line 
```python
warnings.showwarning = send_warning_to_tty
```
 in `lib/spack/spack/main.py`, I get:

```
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:262: UserWarning: Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
```

<details>
<summary>
<code>spack --debug --stacktrace solve</code> (complete output)
</summary>

```
lib/spack/spack/util/executable.py:182 ==> [2021-04-05-16:32:02.572391] '/bin/bash' '--norc' '--noprofile' '-lc' 'echo $CRAY_CPU_TARGET'
lib/spack/spack/platforms/cray.py:154 ==> [2021-04-05-16:32:02.602351] default to front-end architecture
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-16:32:03.817520] Imported solve from built-in commands
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-16:32:03.819655] Imported solve from built-in commands
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:04.161790] Reading config file /dev/shm/spack/test/etc/spack/compilers.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:05.975858] Reading config file /dev/shm/spack/test/etc/spack/defaults/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:06.046715] Reading config file /dev/shm/spack/test/etc/spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:06.056981] Reading config file /u/staff/mbelkin/.spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:06.098538] Reading config file /dev/shm/spack/test/etc/spack/defaults/packages.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:06.203973] Reading config file /dev/shm/spack/test/etc/spack/packages.yaml
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:262: UserWarning: Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:07.882120] Reading config file /dev/shm/spack/test/etc/spack/defaults/repos.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:32:07.888863] Reading config file /dev/shm/spack/test/etc/spack/repos.yaml
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.114932] opt_criterion(15, version weight)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.115407] opt_criterion(14, number of non-default variants (roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.115763] opt_criterion(13, multi-valued variants + preferred providers for roots)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.116110] opt_criterion(11, number of non-default variants (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.116466] opt_criterion(9, number of non-default providers (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.116816] opt_criterion(8, count of non-root multi-valued variants)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.117166] opt_criterion(7, compiler matches + number of nodes)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.117514] opt_criterion(6, version badness)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.117859] opt_criterion(5, non-preferred compilers)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.118202] opt_criterion(4, target matches)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:32:09.118549] opt_criterion(3, non-preferred targets)
lib/spack/spack/cmd/solve.py:123 ==> [2021-04-05-16:32:09.129637] Best of 1 considered solutions.
lib/spack/spack/cmd/solve.py:124 ==> [2021-04-05-16:32:09.129963] Optimization Criteria:
 Priority Criterion Value
 1 version weight 0
 2 number of non-default variants (roots) 0
 3 multi-valued variants + preferred providers for roots 0
 4 number of non-default variants (non-roots) 0
 5 number of non-default providers (non-roots) 0
 6 count of non-root multi-valued variants 0
 7 compiler matches + number of nodes 0
 8 version badness 0
 9 non-preferred compilers 0
 10 target matches 0
 11 non-preferred targets 0
```
</details>

Finally, when I add `warning_message = str(compiler_entry) + "\n" + warning_message` to `lib/spack/external/archspec/cpu/microarchitecture.py` like so:
```diff
 if warning_message:
+ warning_message = str(compiler_entry) + "\n" + warning_message
 warnings.warn(warning_message)
```

I see a number of very similar warnings that look like this:

```console
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'flags': '-msse3', 'name': 'bulldozer'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
```
but for different "flags"


<details>
<summary>
<code>spack --debug --stacktrace solve</code> (complete output)
</summary>

```
lib/spack/spack/util/executable.py:182 ==> [2021-04-05-16:41:15.100831] '/bin/bash' '--norc' '--noprofile' '-lc' 'echo $CRAY_CPU_TARGET'
lib/spack/spack/platforms/cray.py:154 ==> [2021-04-05-16:41:15.120326] default to front-end architecture
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-16:41:16.251029] Imported solve from built-in commands
lib/spack/spack/cmd/__init__.py:122 ==> [2021-04-05-16:41:16.253234] Imported solve from built-in commands
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:16.554406] Reading config file /dev/shm/spack/test/etc/spack/compilers.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:18.307166] Reading config file /dev/shm/spack/test/etc/spack/defaults/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:18.378508] Reading config file /dev/shm/spack/test/etc/spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:18.388623] Reading config file /u/staff/mbelkin/.spack/config.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:18.439507] Reading config file /dev/shm/spack/test/etc/spack/defaults/packages.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:18.543331] Reading config file /dev/shm/spack/test/etc/spack/packages.yaml
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'flags': '-msse3', 'name': 'bulldozer'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'name': 'core-avx2', 'flags': '-march={name} -mtune={name}'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'flags': '-msse4.2', 'name': 'steamroller'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'flags': '-msse3', 'name': 'piledriver'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
/dev/shm/spack/test/lib/spack/external/archspec/cpu/microarchitecture.py:263: UserWarning: {'versions': '16.0:', 'warnings': "Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors", 'flags': '-msse2', 'name': 'k10'}
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors
 warnings.warn(warning_message)
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:20.226405] Reading config file /dev/shm/spack/test/etc/spack/defaults/repos.yaml
lib/spack/spack/config.py:981 ==> [2021-04-05-16:41:20.233054] Reading config file /dev/shm/spack/test/etc/spack/repos.yaml
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.371765] opt_criterion(15, version weight)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.372239] opt_criterion(14, number of non-default variants (roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.372584] opt_criterion(13, multi-valued variants + preferred providers for roots)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.372921] opt_criterion(11, number of non-default variants (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.373259] opt_criterion(9, number of non-default providers (non-roots))
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.373610] opt_criterion(8, count of non-root multi-valued variants)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.373955] opt_criterion(7, compiler matches + number of nodes)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.374295] opt_criterion(6, version badness)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.374632] opt_criterion(5, non-preferred compilers)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.374969] opt_criterion(4, target matches)
lib/spack/spack/solver/asp.py:1566 ==> [2021-04-05-16:41:21.375305] opt_criterion(3, non-preferred targets)
lib/spack/spack/cmd/solve.py:123 ==> [2021-04-05-16:41:21.387813] Best of 1 considered solutions.
lib/spack/spack/cmd/solve.py:124 ==> [2021-04-05-16:41:21.388228] Optimization Criteria:
 Priority Criterion Value
 1 version weight 0
 2 number of non-default variants (roots) 0
 3 multi-valued variants + preferred providers for roots 0
 4 number of non-default variants (non-roots) 0
 5 number of non-default providers (non-roots) 0
 6 count of non-root multi-valued variants 0
 7 compiler matches + number of nodes 0
 8 version badness 0
 9 non-preferred compilers 0
 10 target matches 0
 11 non-preferred targets 0
```
</details>



### Information on your system



* **Spack:** 0.16.1-2041-1908e6834d
* **Python:** 3.7.9
* **Platform:** cray-suse_linux11-bulldozer
* **Concretizer:** clingo




### Additional information


- [x] I have run `spack debug report` and reported the version of Spack/Python/Platform
- [x] I have searched the issues of this repo and believe this is not a duplicate
- [x] I have run the failing commands in debug mode and reported the output

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Unsolicited warnings related to Intel compilers #22786

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Unsolicited warnings related to Intel compilers #22786

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