Fix the RecursiveASTVisitor to not traverse C++ default parameters twice.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150651 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Index/index-refs.cpp b/test/Index/index-refs.cpp
index fa4b4b3..56afa08 100644
--- a/test/Index/index-refs.cpp
+++ b/test/Index/index-refs.cpp
@@ -107,3 +107,4 @@
 
 // CHECK:      [indexEntityReference]: kind: variable | name: array_size | {{.*}} | loc: 59:22
 // CHECK:      [indexEntityReference]: kind: variable | name: default_param | {{.*}} | loc: 62:19
+// CHECK-NOT:  [indexEntityReference]: kind: variable | name: default_param | {{.*}} | loc: 62:19