Make Map::Create always use the Object function, and remove the unused inobject properties

test/cctest/test-heap.cc

 // Copyright 2012 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 974 matching lines @@
   // Increase the chance of 'bump-the-pointer' allocation in old space.
   heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
 
   v8::HandleScope scope(CcTest::isolate());
 
   // The plan: create JSObject which references objects in new space.
   // Then clone this object (forcing it to go into old space) and check
   // that region dirty marks are updated correctly.
 
   // Step 1: prepare a map for the object.  We add 1 inobject property to it.
-  Handle<JSFunction> object_ctor(
-      CcTest::i_isolate()->native_context()->object_function());
-  CHECK(object_ctor->has_initial_map());
   // Create a map with single inobject property.
-  Handle<Map> my_map = Map::Create(object_ctor, 1);
+  Handle<Map> my_map = Map::Create(CcTest::i_isolate(), 1);
   int n_properties = my_map->inobject_properties();
   CHECK_GT(n_properties, 0);
 
   int object_size = my_map->instance_size();
 
   // Step 2: allocate a lot of objects so to almost fill new space: we need
   // just enough room to allocate JSObject and thus fill the newspace.
 
   int allocation_amount = Min(FixedArray::kMaxSize,
                               Page::kMaxRegularHeapObjectSize + kPointerSize);
@@ skipping 3444 matching lines @@
 
 
 TEST(Regress388880) {
   i::FLAG_expose_gc = true;
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
   Heap* heap = isolate->heap();
 
-  Handle<Map> map1 = Map::Create(isolate->object_function(), 1);
+  Handle<Map> map1 = Map::Create(isolate, 1);
   Handle<Map> map2 =
       Map::CopyWithField(map1, factory->NewStringFromStaticChars("foo"),
                          HeapType::Any(isolate), NONE, Representation::Tagged(),
                          OMIT_TRANSITION).ToHandleChecked();
 
   int desired_offset = Page::kPageSize - map1->instance_size();
 
   // Allocate fixed array in old pointer space so, that object allocated
   // afterwards would end at the end of the page.
   {
@@ skipping 33 matching lines @@
 #ifdef DEBUG
 TEST(PathTracer) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
 
   v8::Local<v8::Value> result = CompileRun("'abc'");
   Handle<Object> o = v8::Utils::OpenHandle(*result);
   CcTest::i_isolate()->heap()->TracePathToObject(*o);
 }
 #endif  // DEBUG