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

[Mikhail Goncharov via llvm-commits]

metaflow wrote:

here is a repro from TF (I have not checked by hand, looks like some issues with fp ops)
[tf_ir.txt](https://github.com/llvm/llvm-project/files/13558230/tf_ir.txt)


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