[llvm] [SelectionDAG] Make `(a & x) | (~a & y) -> (a & (x ^ y)) ^ y` available for all targets (PR #137641)

[Ulrich Weigand via llvm-commits]

https://github.com/uweigand commented:

SystemZ changes now LGTM assuming CI passes.  Note one test case issue inline.

https://github.com/llvm/llvm-project/pull/137641