[llvm] [InstCombine] Avoid crash on aggregate types in SimplifyDemandedUseFPClass (PR #111128)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

@mikaelholmen could you test if this resolves the issue you reported? (https://github.com/llvm/llvm-project/pull/110506#issuecomment-2392839509) :slightly_smiling_face: 

https://github.com/llvm/llvm-project/pull/111128