[builtins] Migrate ArrayBufferPrototypeByteLength to C++.

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 2869 matching lines @@
       JSObject::GetProperty(array_prototype, factory()->unscopables_symbol())
           .ToHandleChecked();
   DCHECK(unscopables->IsJSObject());
   JSObject::AddProperty(Handle<JSObject>::cast(unscopables),
                         factory()->values_string(), factory()->true_value(),
                         NONE);
 }
 
 Handle<JSFunction> Genesis::InstallArrayBuffer(Handle<JSObject> target,
                                                const char* name) {
+  // Create the %ArrayBufferPrototype%
   // Setup the {prototype} with the given {name} for @@toStringTag.
   Handle<JSObject> prototype =
       factory()->NewJSObject(isolate()->object_function(), TENURED);
   JSObject::AddProperty(prototype, factory()->to_string_tag_symbol(),
                         factory()->NewStringFromAsciiChecked(name),
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
 
   // Allocate the constructor with the given {prototype}.
   Handle<JSFunction> array_buffer_fun =
       InstallFunction(target, name, JS_ARRAY_BUFFER_TYPE,
                       JSArrayBuffer::kSizeWithInternalFields, prototype,
                       Builtins::kArrayBufferConstructor);
   array_buffer_fun->shared()->set_construct_stub(
       *isolate()->builtins()->ArrayBufferConstructor_ConstructStub());
   array_buffer_fun->shared()->DontAdaptArguments();
   array_buffer_fun->shared()->set_length(1);
 
   // Install the "constructor" property on the {prototype}.
   JSObject::AddProperty(prototype, factory()->constructor_string(),
                         array_buffer_fun, DONT_ENUM);
 
   SimpleInstallFunction(array_buffer_fun, factory()->isView_string(),
                         Builtins::kArrayBufferIsView, 1, true);
 
+  // Install the "byteLength" getter on the {prototype}.
+  SimpleInstallGetter(prototype, factory()->byte_length_string(),
+                      Builtins::kArrayBufferPrototypeGetByteLength, false,
+                      kArrayBufferByteLength);
+
   return array_buffer_fun;
 }
 
 
 Handle<JSFunction> Genesis::InstallInternalArray(Handle<JSObject> target,
                                                  const char* name,
                                                  ElementsKind elements_kind) {
   // --- I n t e r n a l   A r r a y ---
   // An array constructor on the builtins object that works like
   // the public Array constructor, except that its prototype
@@ skipping 1086 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8