[X86] Add X86ISD::CMPM_RND to getVectorMaskingNode to select ISD::AND instead of ISD::VSELECT

A later DAG combine will turn the VSELECT into an AND, but we have the other mask compare opcodes here so add this one too.

llvm-svn: 318931

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -19571,6 +19571,7 @@ static SDValue getVectorMaskingNode(SDValue Op, SDValue Mask,
   case X86ISD::PCMPEQM:
   case X86ISD::PCMPGTM:
   case X86ISD::CMPM:
+  case X86ISD::CMPM_RND:
   case X86ISD::CMPMU:
     return DAG.getNode(ISD::AND, dl, VT, Op, VMask);
   case X86ISD::VFPCLASS: