Several improvements from Doug Gregor related to default
argument handling.  I'll fix up the c89 (void) thing next.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49459 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ExprCXX.cpp b/lib/AST/ExprCXX.cpp
index 03faf8b..323fdd6 100644
--- a/lib/AST/ExprCXX.cpp
+++ b/lib/AST/ExprCXX.cpp
@@ -48,8 +48,8 @@
 
 // CXXDefaultArgExpr
 Stmt::child_iterator CXXDefaultArgExpr::child_begin() {
-  return reinterpret_cast<Stmt**>(Param->getDefaultArg());
+  return child_iterator();
 }
 Stmt::child_iterator CXXDefaultArgExpr::child_end() {
-  return reinterpret_cast<Stmt**>(Param->getDefaultArg())+1;
+  return child_iterator();
 }