Ship ES2015 sloppy-mode const semantics

test/webkit/const-without-initializer.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 //
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 // modification, are permitted provided that the following conditions
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 // 1.  Redistributions of source code must retain the above copyright
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+// Flags: --legacy-const
+
 description(
 'Tests that declaring a const variable without initializing has the correct behavior and does not crash'
 );
 
 const f;
 
 shouldBe('f', 'undefined');
 
 f = 10;
 
 shouldBe('f', 'undefined');