[es6] Unify ArrayBuffer and SharedArrayBuffer constructors.

test/mjsunit/get-prototype-of.js

Index: test/mjsunit/get-prototype-of.js
diff --git a/test/mjsunit/get-prototype-of.js b/test/mjsunit/get-prototype-of.js
index 47edcb0a771123f03dbd275ccf20a3872f2d58bc..a6acf670d177df615868657bd11f375f2b81d8ea 100644
--- a/test/mjsunit/get-prototype-of.js
+++ b/test/mjsunit/get-prototype-of.js
@@ -77,7 +77,6 @@ for (var f of errorFunctions) {
 // Builtin constructors.
 var functions = [
   Array,
-  ArrayBuffer,
   Boolean,
   // DataView,
   Date,
@@ -112,5 +111,8 @@ for (var f of functions) {
 var p = new Promise(function() {});
 assertPrototypeOf(p, Promise.prototype);
 
-var dv = new DataView(new ArrayBuffer());
+var ab = new ArrayBuffer(0);
+assertPrototypeOf(ab, ArrayBuffer.prototype);
+
+var dv = new DataView(ab);
 assertPrototypeOf(dv, DataView.prototype);