Pass legacy const runtime flag to preparser appropriately

test/webkit/fast/js/arguments.js

 // Copyright 2013 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 556 matching lines @@
 var argumentsFunctionConstructorParam = new Function("arguments", "return arguments;");
 shouldBeTrue("argumentsFunctionConstructorParam(true)");
 
 function argumentsVarUndefined()
 {
     var arguments;
     return String(arguments);
 }
 shouldBe("argumentsVarUndefined()", "'[object Arguments]'");
 
-function argumentsConstUndefined()
-{
-    const arguments;
-    return String(arguments);
-}
-shouldBe("argumentsConstUndefined()", "'[object Arguments]'");
-
 function argumentCalleeInException() {
     try {
         throw "";
     } catch (e) {
         return arguments.callee;
     }
 }
 shouldBe("argumentCalleeInException()", "argumentCalleeInException")
 
 function shadowedArgumentsApply(arguments) {
@@ skipping 86 matching lines @@
     Object.defineProperty(arguments, 0, { enumerable: false });
     shouldBeFalse(String( Object.getOwnPropertyDescriptor(arguments, 0).writable ));
     shouldBeFalse(String( Object.getOwnPropertyDescriptor(arguments, 0).enumerable ));
 
     delete arguments[1];
     shouldBeUndefined(String( Object.getOwnPropertyDescriptor(arguments, 1) ));
     Object.defineProperty(arguments, 1, { writable: true });
     shouldBeTrue(String( Object.getOwnPropertyDescriptor(arguments, 1).writable ));
     shouldBeFalse(String( Object.getOwnPropertyDescriptor(arguments, 1).enumerable ));
 })(0,1);