Use ArrayRef<MVT::SimpleValueType> when possible.

Not passing vector references around makes it possible to use
SmallVector in most places.

llvm-svn: 177235
diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.h b/llvm/utils/TableGen/CodeGenDAGPatterns.h
index 424f02f..f949b52 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.h
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.h
@@ -59,7 +59,7 @@
   public:
     TypeSet() {}
     TypeSet(MVT::SimpleValueType VT, TreePattern &TP);
-    TypeSet(const std::vector<MVT::SimpleValueType> &VTList);
+    TypeSet(ArrayRef<MVT::SimpleValueType> VTList);
 
     bool isCompletelyUnknown() const { return TypeVec.empty(); }