ES6 symbols: implement name property

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index 2b7fcf3329014519bce32eb6cb30c919b8ddbd04..6a64cbf802af10184262301df3adcaf3c6a963ac 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -49,6 +49,11 @@ void StaticNewSpaceVisitor<StaticVisitor>::Initialize() {
                   SlicedString::BodyDescriptor,
                   int>::Visit);
 
+  table_.Register(kVisitSymbol,
+                  &FixedBodyVisitor<StaticVisitor,
+                  Symbol::BodyDescriptor,
+                  int>::Visit);
+
   table_.Register(kVisitFixedArray,
                   &FlexibleBodyVisitor<StaticVisitor,
                   FixedArray::BodyDescriptor,
@@ -110,6 +115,11 @@ void StaticMarkingVisitor<StaticVisitor>::Initialize() {
                   SlicedString::BodyDescriptor,
                   void>::Visit);
 
+  table_.Register(kVisitSymbol,
+                  &FixedBodyVisitor<StaticVisitor,
+                  Symbol::BodyDescriptor,
+                  void>::Visit);
+
   table_.Register(kVisitFixedArray, &FixedArrayVisitor::Visit);
 
   table_.Register(kVisitFixedDoubleArray, &DataObjectVisitor::Visit);