[llvm] [ValueTracking] Compute known FPClass from dominating condition (PR #80941)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

The regression https://github.com/dtcxzyw/llvm-opt-benchmark/pull/199#discussion_r1480974120 has been fixed.


https://github.com/llvm/llvm-project/pull/80941