[llvm] [InstCombine] Implement `fcmp (fadd x, 0.0), y` => `fcmp x, y` optimization (PR #88476)

[Vlad Mishel via llvm-commits]

vmishelcs wrote:

@dtcxzyw I see there are some issues with the formatting. Is there a script I can run and commit the changes with fixed formatting?

https://github.com/llvm/llvm-project/pull/88476