Rollup of 11 pull requests

Successful merges:

 - #138944 (Add `__isPlatformVersionAtLeast` and `__isOSVersionAtLeast` symbols)
 - #139113 (unstable book: in a sanitizer example, check the code)
 - #145735 (style-guide: Document absence of trailing whitespace)
 - #146041 (tidy: --bless now makes escheck run with --fix)
 - #146144 (compiler: Apply target features to the entry function)
 - #146225 (Simplify `{f16, f32, f64, f128}::midpoint()`)
 - #146234 (change file-is-generated doc comment to inner)
 - #146241 (rustc_infer: change top-level doc comment to inner)
 - #146242 (Ensure that `--html-after-content` option is used to check `scrape_examples_ice` rustdoc GUI test)
 - #146243 (remove couple of redundant clones)
 - #146250 (Bump stage0 rustfmt)

Failed merges:

 - #146200 (Simplify rustdoc-gui tester by calling directly browser-ui-test)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of #146250 - fmease:bump-stage0-rustfmt, r=Mark-Simulacrum

Bump stage0 rustfmt

Unblocks #146071, cc `@npmccallum.`

Steps to reproduce:

1. Temporarily upgrade `src/tools/bump-stage0`'s `toml` dependency from 0.7 to 0.9 to fix build error (see Zulip topic)
2. Execute `./x run src/tools/bump-stage0`
3. Manually revert changes unrelated to nightly `rustfmt`+`rustc` (the latter needs to be bumped, too, for the driver ([via](#146250 (comment))))

r? `@Mark-Simulacrum` as discussed in [#t-release > Bump stage0 rustfmt separately ("one-off")](https://rust-lang.zulipchat.com/#narrow/channel/241545-t-release/topic/Bump.20stage0.20rustfmt.20separately.20.28.22one-off.22.29/with/537916615)

Fix `bump-stage0` build failure, and check-build `bump-stage0` in CI

This PR bumps the `toml` dependency of the `bump-stage0` tool to `0.8.23`, which AFAICT is the highest `toml` version that's present in the r-l/r workspace's `Cargo.lock` already (so we don't introduce _another_ `toml 0.x.*` series). I added some byte-buffer-to-string intermediary to workaround `toml 0.8.*` not having the `toml 0.9.*` `toml::from_slice` API.

To catch obvious build failures of the `src/tools/bump-stage0` tool early, before we find out it can't even build when we really need it to work.

Contexts:

- rust-lang#146250 (comment)
- [#t-release > Bump stage0 rustfmt separately ("one-off") @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/241545-t-release/topic/Bump.20stage0.20rustfmt.20separately.20.28.22one-off.22.29/near/537916615)

Fixes rust-lang#146252.

Rollup merge of #146263 - jieyouxu:check-bump-stage0, r=Kobzol

Fix `bump-stage0` build failure, and check-build `bump-stage0` in CI

This PR bumps the `toml` dependency of the `bump-stage0` tool to `0.8.23`, which AFAICT is the highest `toml` version that's present in the r-l/r workspace's `Cargo.lock` already (so we don't introduce _another_ `toml 0.x.*` series). I added some byte-buffer-to-string intermediary to workaround `toml 0.8.*` not having the `toml 0.9.*` `toml::from_slice` API.

To catch obvious build failures of the `src/tools/bump-stage0` tool early, before we find out it can't even build when we really need it to work.

Contexts:

- #146250 (comment)
- [#t-release > Bump stage0 rustfmt separately ("one-off") @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/241545-t-release/topic/Bump.20stage0.20rustfmt.20separately.20.28.22one-off.22.29/near/537916615)

Fixes #146252.