[X86] Teach PostprocessISelDAG to fold ANDrm+TESTrr when chain result is used.
The isOnlyUserOf prevented the fold if the chain result had any
users. What we really care about is the the data result from the
AND is only used by the TEST, and the flags results from the ANDs
aren't used at all. It's ok if the chain has users, we just need
to replace those users with the chain from the TESTrm.
Reviewed By: LuoYuanke
Differential Revision: https://reviews.llvm.org/D131117
GitOrigin-RevId: 91e8079cd535a736cb6aabd24fc310a8ec46a07f
2 files changed
