[llvm] [X86][NVPTX][LegalizeDAG] If i16 legal, legalize FABS/FNEG/FCOPYSIGN (f16) with Expand (PR #106153)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

This is still papering over a bug - the promote action is just busted and needs to be replaced or removed 

https://github.com/llvm/llvm-project/pull/106153