[Isolates] Add a pointer to Heap to a meta map.

src/heap.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1342 matching lines @@
 
 Object* Heap::AllocatePartialMap(InstanceType instance_type,
                                  int instance_size) {
   Object* result = AllocateRawMap();
   if (result->IsFailure()) return result;
 
   // Map::cast cannot be used due to uninitialized map field.
   reinterpret_cast<Map*>(result)->set_map(raw_unchecked_meta_map());
   reinterpret_cast<Map*>(result)->set_instance_type(instance_type);
   reinterpret_cast<Map*>(result)->set_instance_size(instance_size);
-  reinterpret_cast<Map*>(result)->
-      set_scavenger(GetScavenger(instance_type, instance_size));
+  if (instance_type == MAP_TYPE) {
+    reinterpret_cast<Map*>(result)->set_heap(this);
+  } else {
+    reinterpret_cast<Map*>(result)->set_scavenger(GetScavenger(instance_type,
+                                                               instance_size));
+  }
   reinterpret_cast<Map*>(result)->set_inobject_properties(0);
   reinterpret_cast<Map*>(result)->set_pre_allocated_property_fields(0);
   reinterpret_cast<Map*>(result)->set_unused_property_fields(0);
   reinterpret_cast<Map*>(result)->set_bit_field(0);
   reinterpret_cast<Map*>(result)->set_bit_field2(0);
   return result;
 }
 
 
 Object* Heap::AllocateMap(InstanceType instance_type, int instance_size) {
@@ skipping 490 matching lines @@
   Object* obj = AllocateFixedArray(number_string_cache_size * 2, TENURED);
   if (!obj->IsFailure()) set_number_string_cache(FixedArray::cast(obj));
   return obj;
 }
 
 
 void Heap::FlushNumberStringCache() {
   // Flush the number to string cache.
   int len = number_string_cache()->length();
   for (int i = 0; i < len; i++) {
-    number_string_cache()->set_undefined(i);
+    number_string_cache()->set_undefined(this, i);
   }
 }
 
 
 static inline int double_get_hash(double d) {
   DoubleRepresentation rep(d);
   return static_cast<int>(rep.bits) ^ static_cast<int>(rep.bits >> 32);
 }
 
 
@@ skipping 3108 matching lines @@
 }
 
 
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 } }  // namespace v8::internal