Minor change. Since the checks are equivalent, use isMMX

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113239 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 974d9eb..a313365 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5475,7 +5475,7 @@
   // Only a few shuffle masks are handled for 64-bit vectors (MMX), and
   // 64-bit vectors which made to this point can't be handled, they are
   // expanded.
-  if (VT.getSizeInBits() == 64)
+  if (isMMX)
     return SDValue();
 
   if (ShuffleVectorSDNode::isSplatMask(&M[0], VT) &&