Add a new expression kind, OpaqueValueExpr, which is useful for
certain internal type-checking procedures as well as for representing
certain implicitly-generated operations.  Uses to follow.

llvm-svn: 119289
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 8a6d4ba..d0b4c31 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -2541,6 +2541,7 @@
   case Expr::BlockExprClass:
   case Expr::BlockDeclRefExprClass:
   case Expr::NoStmtClass:
+  case Expr::OpaqueValueExprClass:
     return ICEDiag(2, E->getLocStart());
 
   case Expr::GNUNullExprClass: