[llvm] [InstCombine] Propagate FMF from select instead of fcmp (PR #141010)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

All real-world regressions have been addressed: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/2380
I am not sure if we should add nsz to address regressions in tests.


https://github.com/llvm/llvm-project/pull/141010