Add support for the OpenCL vec_step operator, by generalising and
extending the existing support for sizeof and alignof.  Original
patch by Guy Benyei.

llvm-svn: 127475
diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index 890898a..3767922 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -128,7 +128,7 @@
     // Expressions that are prvalues.
   case Expr::CXXBoolLiteralExprClass:
   case Expr::CXXPseudoDestructorExprClass:
-  case Expr::SizeOfAlignOfExprClass:
+  case Expr::UnaryExprOrTypeTraitExprClass:
   case Expr::CXXNewExprClass:
   case Expr::CXXThisExprClass:
   case Expr::CXXNullPtrLiteralExprClass: