[llvm-branch-commits] [llvm] release/21.x: [X86] Only fold AND/ANDNP back to VSELECT if we know the predicated mask select is legal (#156663) (PR #157047)

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llvmbot wrote:

@phoebewang What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/157047