Install ConstructNonConstructable as construct stub for non-constructables.

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

Index: test/webkit/class-syntax-default-constructor.js
diff --git a/test/webkit/class-syntax-default-constructor.js b/test/webkit/class-syntax-default-constructor.js
index 841afddadcc374eaae10ac8d0be9beb6de828402..1695f6a8da7f95194b9db2eace38287090ab8265 100644
--- a/test/webkit/class-syntax-default-constructor.js
+++ b/test/webkit/class-syntax-default-constructor.js
@@ -29,11 +29,11 @@ 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');