[llvm] [InstCombine] Remove redundant fptrunc of select fold (NFCI) (PR #117182)

[Yingwei Zheng via llvm-commits]

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

LGTM. Remember to update the test https://github.com/llvm/llvm-project/commit/f81f47e3ff29598fdf58cde94ccf2c7d4be53df5 :)


https://github.com/llvm/llvm-project/pull/117182