[heap] ExternalStringTable: Separate Iterate and CleanUp methods

src/heap/heap-inl.h

Index: src/heap/heap-inl.h
diff --git a/src/heap/heap-inl.h b/src/heap/heap-inl.h
index f418cae2f0355a39716e21c2ca317f0baafa77d0..c3fa55aed9b2eacd2b28af34f905b101d9f38983 100644
--- a/src/heap/heap-inl.h
+++ b/src/heap/heap-inl.h
@@ -702,12 +702,15 @@ void Heap::ExternalStringTable::AddString(String* string) {
   }
 }
 
-
-void Heap::ExternalStringTable::Iterate(ObjectVisitor* v) {
+void Heap::ExternalStringTable::IterateNewSpaceStrings(ObjectVisitor* v) {
   if (!new_space_strings_.is_empty()) {
     Object** start = &new_space_strings_[0];
     v->VisitPointers(start, start + new_space_strings_.length());
   }
+}
+
+void Heap::ExternalStringTable::IterateAll(ObjectVisitor* v) {
+  IterateNewSpaceStrings(v);
   if (!old_space_strings_.is_empty()) {
     Object** start = &old_space_strings_[0];
     v->VisitPointers(start, start + old_space_strings_.length());