Install ConstructNonConstructable as construct stub for non-constructables.

test/webkit/class-syntax-default-constructor.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
 //     notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --harmony-sloppy
 
 description('Tests for ES6 class syntax default constructor');
 
 class A { };
 class B extends A { };
 
 shouldBeTrue('new A instanceof A');
-shouldThrow('A()', '"TypeError: Class constructors cannot be invoked without \'new\'"');
+shouldThrow('A()', '"TypeError: Class constructor A cannot be invoked without \'new\'"');
 shouldBeTrue('A.prototype.constructor instanceof Function');
 shouldBe('A.prototype.constructor.name', '"A"');
 shouldBeTrue('new B instanceof A; new B instanceof A');
-shouldThrow('B()', '"TypeError: Class constructors cannot be invoked without \'new\'"');
+shouldThrow('B()', '"TypeError: Class constructor B cannot be invoked without \'new\'"');
 shouldBe('B.prototype.constructor.name', '"B"');
 shouldBeTrue('A !== B');
 shouldBeTrue('A.prototype.constructor !== B.prototype.constructor');
 shouldBe('new (class extends (class { constructor(a, b) { return [a, b]; } }) {})(1, 2)', '[1, 2]');
 
 var successfullyParsed = true;