[regexp] remove no-op RegExp.multiline accessor and alias

src/js/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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
@@ skipping 398 matching lines @@
 var RegExpSetInput = function(string) {
   LAST_INPUT(RegExpLastMatchInfo) = TO_STRING(string);
 };
 
 %OptimizeObjectForAddingMultipleProperties(GlobalRegExp, 22);
 %DefineAccessorPropertyUnchecked(GlobalRegExp, 'input', RegExpGetInput,
                                  RegExpSetInput, DONT_DELETE);
 %DefineAccessorPropertyUnchecked(GlobalRegExp, '$_', RegExpGetInput,
                                  RegExpSetInput, DONT_ENUM | DONT_DELETE);
 
-// The properties multiline and $* are aliases for each other.  When this
-// value is set in SpiderMonkey, the value it is set to is coerced to a
-// boolean.  We mimic that behavior with a slight difference: in SpiderMonkey
-// the value of the expression 'RegExp.multiline = null' (for instance) is the
-// boolean false (i.e., the value after coercion), while in V8 it is the value
-// null (i.e., the value before coercion).
-
-// Getter and setter for multiline.
-var multiline = false;
-var RegExpGetMultiline = function() { return multiline; };
-var RegExpSetMultiline = function(flag) { multiline = flag ? true : false; };
-
-%DefineAccessorPropertyUnchecked(GlobalRegExp, 'multiline', RegExpGetMultiline,
-                                 RegExpSetMultiline, DONT_DELETE);
-%DefineAccessorPropertyUnchecked(GlobalRegExp, '$*', RegExpGetMultiline,
-                                 RegExpSetMultiline,
-                                 DONT_ENUM | DONT_DELETE);
-
-
 var NoOpSetter = function(ignored) {};
 
 
 // Static properties set by a successful match.
 %DefineAccessorPropertyUnchecked(GlobalRegExp, 'lastMatch', RegExpGetLastMatch,
                                  NoOpSetter, DONT_DELETE);
 %DefineAccessorPropertyUnchecked(GlobalRegExp, '$&', RegExpGetLastMatch,
                                  NoOpSetter, DONT_ENUM | DONT_DELETE);
 %DefineAccessorPropertyUnchecked(GlobalRegExp, 'lastParen', RegExpGetLastParen,
                                  NoOpSetter, DONT_DELETE);
@@ skipping 21 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })