Add missing break in 256-bit palignr comment printing. No test case yet because the comment itself is still wrong.

llvm-svn: 173669
diff --git a/llvm/lib/Target/X86/InstPrinter/X86InstComments.cpp b/llvm/lib/Target/X86/InstPrinter/X86InstComments.cpp
index 43a8f0f..865930a 100644
--- a/llvm/lib/Target/X86/InstPrinter/X86InstComments.cpp
+++ b/llvm/lib/Target/X86/InstPrinter/X86InstComments.cpp
@@ -90,6 +90,7 @@
     DecodePALIGNRMask(MVT::v32i8,
                       MI->getOperand(MI->getNumOperands()-1).getImm(),
                       ShuffleMask);
+    break;
 
   case X86::PSHUFDri:
   case X86::VPSHUFDri: