Revert of [es6] Correctify and unify ArrayBuffer and SharedArrayBuffer constructors.

src/js/arraybuffer.js

Index: src/js/arraybuffer.js
diff --git a/src/js/arraybuffer.js b/src/js/arraybuffer.js
index 1ee68ca291b0ccc6c6affc79af5c7bcc6b90c493..1e405638d582936b83461502706d0b6b9310f920 100644
--- a/src/js/arraybuffer.js
+++ b/src/js/arraybuffer.js
@@ -12,17 +12,30 @@
 // Imports
 
 var GlobalArrayBuffer = global.ArrayBuffer;
+var GlobalObject = global.Object;
 var MakeTypeError;
 var MaxSimple;
 var MinSimple;
+var ToPositiveInteger;
+var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
+  ToPositiveInteger = from.ToPositiveInteger;
 });
 
 // -------------------------------------------------------------------
+
+function ArrayBufferConstructor(length) { // length = 1
+  if (!IS_UNDEFINED(new.target)) {
+    var byteLength = ToPositiveInteger(length, kInvalidArrayBufferLength);
+    %ArrayBufferInitialize(this, byteLength, kNotShared);
+  } else {
+    throw MakeTypeError(kConstructorNotFunction, "ArrayBuffer");
+  }
+}
 
 function ArrayBufferGetByteLen() {
   if (!IS_ARRAYBUFFER(this)) {
@@ -69,8 +82,28 @@
   return result;
 }
 
+function ArrayBufferIsViewJS(obj) {
+  return %ArrayBufferIsView(obj);
+}
+
+
+// Set up the ArrayBuffer constructor function.
+%SetCode(GlobalArrayBuffer, ArrayBufferConstructor);
+%FunctionSetPrototype(GlobalArrayBuffer, new GlobalObject());
+
+// Set up the constructor property on the ArrayBuffer prototype object.
+%AddNamedProperty(
+    GlobalArrayBuffer.prototype, "constructor", GlobalArrayBuffer, DONT_ENUM);
+
+%AddNamedProperty(GlobalArrayBuffer.prototype,
+    toStringTagSymbol, "ArrayBuffer", DONT_ENUM | READ_ONLY);
+
 utils.InstallGetter(GlobalArrayBuffer.prototype, "byteLength",
                     ArrayBufferGetByteLen);
+
+utils.InstallFunctions(GlobalArrayBuffer, DONT_ENUM, [
+  "isView", ArrayBufferIsViewJS
+]);
 
 utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [
   "slice", ArrayBufferSlice