Fix signed/unsigned warning. NFCI

llvm-svn: 373870

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -6809,7 +6809,7 @@ static bool getTargetShuffleAndZeroables(SDValue N, SmallVectorImpl<int> &Mask,
     }
   }
 
-  assert(VT.getVectorNumElements() == Size &&
+  assert(VT.getVectorNumElements() == (unsigned)Size &&
          "Different mask size from vector size!");
   return true;
 }