Remove RegExp.$input.

src/regexp.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Array = global.Array;
 
 var $RegExp = global.RegExp;
@@ skipping 392 matching lines @@
   };
   var RegExpSetInput = function(string) {
     LAST_INPUT(lastMatchInfo) = ToString(string);
   };
 
   %OptimizeObjectForAddingMultipleProperties($RegExp, 22);
   %DefineAccessorPropertyUnchecked($RegExp, 'input', RegExpGetInput,
                                    RegExpSetInput, DONT_DELETE);
   %DefineAccessorPropertyUnchecked($RegExp, '$_', RegExpGetInput,
                                    RegExpSetInput, DONT_ENUM | DONT_DELETE);
-  %DefineAccessorPropertyUnchecked($RegExp, '$input', RegExpGetInput,
-                                   RegExpSetInput, DONT_ENUM | DONT_DELETE);
 
   // The properties multiline and $* are aliases for each other.  When this
   // value is set in SpiderMonkey, the value it is set to is coerced to a
   // boolean.  We mimic that behavior with a slight difference: in SpiderMonkey
   // the value of the expression 'RegExp.multiline = null' (for instance) is the
   // boolean false (i.e., the value after coercion), while in V8 it is the value
   // null (i.e., the value before coercion).
 
   // Getter and setter for multiline.
   var multiline = false;
@@ skipping 32 matching lines @@
 
   for (var i = 1; i < 10; ++i) {
     %DefineAccessorPropertyUnchecked($RegExp, '$' + i,
                                      RegExpMakeCaptureGetter(i), NoOpSetter,
                                      DONT_DELETE);
   }
   %ToFastProperties($RegExp);
 }
 
 SetUpRegExp();