Properly check for builtin derived code

[clubby789]

Fixes #108122

[rustbot]

r? @jackh726

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[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

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If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

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[compiler-errors]

Should this be a rustc_* attr rather than have its own feature gate?

[clubby789]

I didn't make it rustc_ since the macros are technically (at least at the place where the allow_internal_unstable is) part of std rather than rustc but I'll move it if you think that makes more sense

[clubby789]

Updated to check for an automatically_derived trait impl that comes from an expansion of a derive macro annotated rustc_builtin_macro

@rustbot label -T-libs

[jackh726]

@bors r+

[bors]

📌 Commit 90f642b has been approved by jackh726

It is now in the queue for this repository.

[bors]

⌛ Testing commit 90f642b with merge a56d216122f14e2cc26dffbf3304e85b2dcaee2d...

[bors]

💥 Test timed out

[tmiasko]

@bors retry timeout

[bors]

⌛ Testing commit 90f642b with merge 21e5b94...

[bors]

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing 21e5b94 to master...

[rust-timer]

Finished benchmarking commit (21e5b94): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

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