[clang] [llvm] [ValueTracking] use KnownBits to compute fpclass from bitcast (PR #97762)

[Yingwei Zheng via cfe-commits]

dtcxzyw wrote:

Please update these failed tests:

> Failed Tests (2):
  LLVM :: CodeGen/AMDGPU/anyext.ll
  LLVM :: CodeGen/AMDGPU/fneg-modifier-casting.ll


https://github.com/llvm/llvm-project/pull/97762