Changes from Git (git http://labmaster3.local/git/llvm-project.git)
[X86] Remove unnecessary isNullConstant in LowerSelect. NFC (details)
[X86] Remove unnecessary isNullConstant in LowerSelect. NFC
At this point in the code we know that Op1 or Op2 is all ones. Y points to the other operand. In the case that Op2 is zero, Op1 must be all ones and Y is Op2. The OR ORs Y into Res. But if Y is 0 the OR will be folded away by getNode so we don't need to check for it.