[DAGCombine][NFC] Masked merge unfolding: comment: some tests are non-canonical

As requested in https://reviews.llvm.org/D46494#inline-407282

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331650 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed