[llvm] [InstSimplify] Simplify fcmp implied by dominating fcmp (PR #161090)

[Rajveer Singh Bharadwaj via llvm-commits]

https://github.com/Rajveer100 approved this pull request.

LG once [llvm/test/CodeGen/AMDGPU/sgpr-copy.ll](https://github.com/llvm/llvm-project/pull/161090/files#diff-3b5ff5ef08dca7f4ef60d9f44ff81824536d2d04c90d2033410018556f299e77) is addressed.

https://github.com/llvm/llvm-project/pull/161090