[llvm] [InstCombine] Fold fptoui(fadd(uitofp(X), C)) to X (PR #210588)

[Arda Serdar Pektezol via llvm-commits]

https://github.com/pektezol commented:

Two more points from me. I can't give approval, but it looks okay to me after these points.

https://github.com/llvm/llvm-project/pull/210588