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

[Matt Arsenault via llvm-commits]

arsenm wrote:

> https://godbolt.org/z/beee7s77x

Ok, so delete any reference to FP80 vectors and use something real 

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