Initial implementation of __atomic_* (everything except __atomic_is_lock_free).

llvm-svn: 141632
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index c0f913d..85cb40f 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -2857,6 +2857,7 @@
   case Expr::AsTypeExprClass:
   case Expr::ObjCIndirectCopyRestoreExprClass:
   case Expr::MaterializeTemporaryExprClass:
+  case Expr::AtomicExprClass:
     return ICEDiag(2, E->getLocStart());
 
   case Expr::InitListExprClass: