[llvm] [X86] Remove LowerFCanonicalize and use generic expansion (PR #147877)

[via llvm-commits]

woruyu wrote:

@arsenm @RKSimon

Right now I’m not quite sure how to move this patch forward.

Since the target hook is gone and X86 is handled via generic expansion, what would be a good next step here?  
Should I try to modify some of the AMDGPU code to make the tests regression pass?

Open to suggestions — just want to make sure I'm going in the right direction.

https://github.com/llvm/llvm-project/pull/147877