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

[Yingwei Zheng via cfe-commits]

dtcxzyw 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?

```
cd llvm-project
git checkout main
wget https://github.com/llvm/llvm-project/pull/74056.patch
git apply 74056.patch
```


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