[clang] [llvm] [IR] Allow fast math flags on calls with homogeneous FP struct types (PR #110506)

[Mikael Holmén via cfe-commits]

mikaelholmen wrote:

Hi,

I bisected a crash to this patch. I can't share the C reproducer but it's instcombine that crashes and a reduced reproducer for that is
```opt -passes=instcombine bbi-99792.ll -o /dev/null```

[bbi-99792.ll.gz](https://github.com/user-attachments/files/17253640/bbi-99792.ll.gz)


https://github.com/llvm/llvm-project/pull/110506