[X86] Don't pass a zero input to the passthru operand of...

[X86] Don't pass a zero input to the passthru operand of getVectorMaskingNode/getScalarMaskingNode when its going to emit an ISD::OR/ISD::AND. NFCI

In those cases, the pass thru operand of the methods isn't used. The calls to the scalar version were passing a MVT::i1 zero, which is an illegal type at the stage this code runs.

llvm-svn: 320928