C++1y: Allow aggregates to have default initializers.

Add a CXXDefaultInitExpr, analogous to CXXDefaultArgExpr, and use it both in
CXXCtorInitializers and in InitListExprs to represent a default initializer.

There's an additional complication here: because the default initializer can
refer to the initialized object via its 'this' pointer, we need to make sure
that 'this' points to the right thing within the evaluation.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179958 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ItaniumMangle.cpp b/lib/AST/ItaniumMangle.cpp
index e82b017..0b77933 100644
--- a/lib/AST/ItaniumMangle.cpp
+++ b/lib/AST/ItaniumMangle.cpp
@@ -2473,6 +2473,10 @@
     mangleExpression(cast<CXXDefaultArgExpr>(E)->getExpr(), Arity);
     break;
 
+  case Expr::CXXDefaultInitExprClass:
+    mangleExpression(cast<CXXDefaultInitExpr>(E)->getExpr(), Arity);
+    break;
+
   case Expr::SubstNonTypeTemplateParmExprClass:
     mangleExpression(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(),
                      Arity);