[es6] Unify ArrayBuffer and SharedArrayBuffer constructors.

src/js/harmony-sharedarraybuffer.js

 // Copyright 2015 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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 var GlobalSharedArrayBuffer = global.SharedArrayBuffer;
-var GlobalObject = global.Object;
 var MakeTypeError;
-var ToPositiveInteger;
-var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
-  ToPositiveInteger = from.ToPositiveInteger;
 })
 
 // -------------------------------------------------------------------
 
-function SharedArrayBufferConstructor(length) { // length = 1
-  if (!IS_UNDEFINED(new.target)) {
-    var byteLength = ToPositiveInteger(length, kInvalidArrayBufferLength);
-    %ArrayBufferInitialize(this, byteLength, kShared);
-  } else {
-    throw MakeTypeError(kConstructorNotFunction, "SharedArrayBuffer");
-  }
-}
-
 function SharedArrayBufferGetByteLen() {
   if (!IS_SHAREDARRAYBUFFER(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'SharedArrayBuffer.prototype.byteLength', this);
   }
   return %_ArrayBufferGetByteLength(this);
 }
 
-function SharedArrayBufferIsViewJS(obj) {
-  return %ArrayBufferIsView(obj);
-}
-
-
-// Set up the SharedArrayBuffer constructor function.
-%SetCode(GlobalSharedArrayBuffer, SharedArrayBufferConstructor);
-%FunctionSetPrototype(GlobalSharedArrayBuffer, new GlobalObject());
-
-// Set up the constructor property on the SharedArrayBuffer prototype object.
-%AddNamedProperty(GlobalSharedArrayBuffer.prototype, "constructor",
-                  GlobalSharedArrayBuffer, DONT_ENUM);
-
-%AddNamedProperty(GlobalSharedArrayBuffer.prototype,
-    toStringTagSymbol, "SharedArrayBuffer", DONT_ENUM | READ_ONLY);
-
 utils.InstallGetter(GlobalSharedArrayBuffer.prototype, "byteLength",
                     SharedArrayBufferGetByteLen);
 
-utils.InstallFunctions(GlobalSharedArrayBuffer, DONT_ENUM, [
-    "isView", SharedArrayBufferIsViewJS
-]);
-
 })