teach child iterators to walk into the child string of an ObjCStringLiteral,
so it shows up in -ast-dump.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64901 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Expr.cpp b/lib/AST/Expr.cpp
index e436a41..dec1749 100644
--- a/lib/AST/Expr.cpp
+++ b/lib/AST/Expr.cpp
@@ -1803,10 +1803,10 @@
 
 // ObjCStringLiteral
 Stmt::child_iterator ObjCStringLiteral::child_begin() { 
-  return child_iterator();
+  return &String;
 }
 Stmt::child_iterator ObjCStringLiteral::child_end() {
-  return child_iterator();
+  return &String+1;
 }
 
 // ObjCEncodeExpr