[llvm] [InstSimplify] Simplify fcmp implied by dominating fcmp (PR #161090)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> We may need to adjust JumpThreading to handle this case.
Why can't it be done here if I may ask?

Generally, only one component is involved in one patch. Although this patch doesn't resolve the original issue, it still removes many redundant fcmps in real-world code.


https://github.com/llvm/llvm-project/pull/161090