Heap profiler: account primitive string objects as being constructed using 'String'.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 9ea131fa7b77e46ab1d19d86d6af3f46a30b3ebb..583af7c58a2f645b3fea67ee43f66f72d9888b62 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1186,7 +1186,9 @@ void HeapNumber::HeapNumberPrint(StringStream* accumulator) {
 
 
 String* JSObject::class_name() {
-  if (IsJSFunction()) return Heap::function_class_symbol();
+  if (IsJSFunction()) {
+    return Heap::function_class_symbol();
+  }
   if (map()->constructor()->IsJSFunction()) {
     JSFunction* constructor = JSFunction::cast(map()->constructor());
     return String::cast(constructor->shared()->instance_class_name());
@@ -1196,6 +1198,20 @@ String* JSObject::class_name() {
 }
 
 
+String* JSObject::constructor_name() {
+  if (IsJSFunction()) {
+    return Heap::function_class_symbol();
+  }
+  if (map()->constructor()->IsJSFunction()) {
+    JSFunction* constructor = JSFunction::cast(map()->constructor());
+    String* name = String::cast(constructor->shared()->name());
+    return name->length() > 0 ? name : constructor->shared()->inferred_name();
+  }
+  // If the constructor is not present, return "Object".
+  return Heap::Object_symbol();
+}
+
+
 void JSObject::JSObjectIterateBody(int object_size, ObjectVisitor* v) {
   // Iterate over all fields in the body. Assumes all are Object*.
   IteratePointers(v, kPropertiesOffset, object_size);