Fix warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148301 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 8f69b0e..ab5a8de 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -6245,7 +6245,7 @@
   // then the EXTRACT_VECTOR_ELT is likely to be legalized to a sequence of
   // EXTRACT_SUBVECTOR + EXTRACT_VECTOR_ELT, which are not detected at this point
   // because the legalization of N did not happen yet.
-  if (Idx >= NumElems/2 && VT.getSizeInBits() == 256)
+  if (Idx >= (int)NumElems/2 && VT.getSizeInBits() == 256)
     return false;
 
   // Skip one more bit_convert if necessary