[llvm] ValueTracking: Identify implied fp classes by general fcmp (PR #66505)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Chromium is hitting the same assert. See the attached reproducer at https://bugs.chromium.org/p/chromium/issues/detail?id=1501322#c3
> 
> I'll revert to green for now.

I'm pushing the fix once ninja check completes 

https://github.com/llvm/llvm-project/pull/66505