[typedarrays] Remove duplicate initial map creation

src/bootstrapper.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 2588 matching lines @@
                                 Handle<JSFunction>* fun) {
   Handle<JSObject> global = Handle<JSObject>(native_context()->global_object());
 
   Handle<JSObject> typed_array_prototype =
       Handle<JSObject>(isolate()->typed_array_prototype());
   Handle<JSFunction> typed_array_function =
       Handle<JSFunction>(isolate()->typed_array_function());
 
   Handle<JSObject> prototype =
       factory()->NewJSObject(isolate()->object_function(), TENURED);
-  Handle<JSFunction> result =
-      InstallFunction(global, name, JS_TYPED_ARRAY_TYPE, JSTypedArray::kSize,
-                      prototype, Builtins::kIllegal);
-
-  Handle<Map> initial_map = isolate()->factory()->NewMap(
-      JS_TYPED_ARRAY_TYPE,
-      JSTypedArray::kSizeWithInternalFields,
-      elements_kind);
-  JSFunction::SetInitialMap(result, initial_map,
-                            handle(initial_map->prototype(), isolate()));
+  Handle<JSFunction> result = InstallFunction(
+      global, name, JS_TYPED_ARRAY_TYPE, JSTypedArray::kSizeWithInternalFields,
+      prototype, Builtins::kIllegal);
+  result->initial_map()->set_elements_kind(elements_kind);
 
   CHECK(JSObject::SetPrototype(result, typed_array_function, false,
                                Object::DONT_THROW)
             .FromJust());
 
   CHECK(JSObject::SetPrototype(prototype, typed_array_prototype, false,
                                Object::DONT_THROW)
             .FromJust());
   *fun = result;
 }
@@ skipping 1911 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8