[X86] canonicalizeBitSelect - don't attempt to canonicalize mask registers

We don't use X86ISD::ANDNP for mask registers.

Test case from @craig.topper (Craig Topper)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356696 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed