This blocks the ability to build applications on this arm64 platform.

Steps to reproduce

It can be easily reproduced by typing "dotnet new" on the command-line

It can also be reproduced by attempting to build vsts-agent on Ubuntu 16.04 Arm64 platform. dev.sh need dotcli library version changed from 2.0.3 to 2.2.100-preview1-008633.

Expected behavior

Build fails and illegal instructions is printed on the console and also in dmesg

Actual behavior

No illegal instruction should occur

Environment data

dotnet --info output:

root@dmx-yic1:~/vsts-agent/src# ../_dotnetsdk/2.2.100-preview1-008633/dotnet --info
.NET Core SDK (reflecting any global.json):
Version: 2.2.100-preview1-008633
Commit: 8c937a0

Runtime Environment:
OS Name: ubuntu
OS Version: 16.04
OS Platform: Linux
RID: ubuntu.16.04-x64
Base Path: /root/vsts-agent/_dotnetsdk/2.2.100-preview1-008633/sdk/2.2.100-preview1-008633/

Host (useful for support):
Version: 2.1.0-preview3-26411-06
Commit: 8faa8fcfcf

.NET Core SDKs installed:
2.2.100-preview1-008633 [/root/vsts-agent/_dotnetsdk/2.2.100-preview1-008633/sdk]

.NET Core runtimes installed:
Microsoft.NETCore.App 2.1.0-preview3-26411-06 [/root/vsts-agent/_dotnetsdk/2.2.100-preview1-008633/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

output of uname -a:

root@dmx-yic1:~/vsts-agent/src# uname -a
Linux dmx-yic1 3.18.14-eng #4287 SMP PREEMPT Thu Nov 16 00:57:06 MST 2017 aarch64 aarch64 aarch64 GNU/Linux

Let me know if you need any other details