AaronBallman wrote:

> Given that this is for a clang extension and not a conformance issue, I'm 
> inclined to revert.
> 
> It might make sense to do that, yeah. Either way, we should investigate 
> what’s going on here. @AaronBallman wdyt?

Definitely worth investigating, unsure whether this is sufficiently disruptive 
to warrant a revert as opposed to a fix forward. I don't oppose a revert if 
@nikic would like to see one, but I realize now that we have no wording in our 
revert policy regarding incremental compile time performance regressions (if it 
was a huge regression, I think it falls under correctness, but this is a 
relatively small change in performance and no bots are red as a result either). 
So if we think this warrants a revert, should we consider updating the policy 
to more clearly state when to revert for performance reasons?

https://github.com/llvm/llvm-project/pull/84983
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