[llvm] [SDAG[[X86] Added method to scalarize `STRICT_FSETCC` (PR #154486)

[via llvm-commits]

mahesh-attarde wrote:

> Wait, vectors of fp80 are allowed? Can we make that a verifier error? Can you test with a real element type?
https://github.com/llvm/llvm-project/blob/dc23869f98452ca2c4086f12bb431a8d6fdb8169/llvm/test/CodeGen/X86/pr34177.ll#L87-L89
We have existing tet "pr34177.ll" that did make use of ` <4 x x86_fp80>` and scalarized.

https://github.com/llvm/llvm-project/pull/154486