Initial implementation of __atomic_* (everything except __atomic_is_lock_free).

llvm-svn: 141632
diff --git a/clang/lib/AST/ExprClassification.cpp b/clang/lib/AST/ExprClassification.cpp
index 624e9d2..49c6821 100644
--- a/clang/lib/AST/ExprClassification.cpp
+++ b/clang/lib/AST/ExprClassification.cpp
@@ -162,6 +162,7 @@
   case Expr::SubstNonTypeTemplateParmPackExprClass:
   case Expr::AsTypeExprClass:
   case Expr::ObjCIndirectCopyRestoreExprClass:
+  case Expr::AtomicExprClass:
     return Cl::CL_PRValue;
 
     // Next come the complicated cases.