[clang] [llvm] Reapply "InstCombine: Introduce SimplifyDemandedUseFPClass"" (PR #74056)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> I don't know why it fails:
> 
> ```
> error: patch failed: llvm/lib/Transforms/InstCombine/InstCombineInternal.h:551
> error: llvm/lib/Transforms/InstCombine/InstCombineInternal.h: patch does not apply
> error: patch failed: llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:466
> error: llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp: patch does not apply
> ```
> 

How are you trying to apply this?

https://github.com/llvm/llvm-project/pull/74056