[runtime] Remove obsolete %ObjectEquals runtime entry.

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 239 matching lines @@
     var matchIndices = %_RegExpExec(regexp, string, 0, RegExpLastMatchInfo);
     if (IS_NULL(matchIndices)) {
       this.lastIndex = 0;
       return false;
     }
     return true;
   }
 }
 
 function TrimRegExp(regexp) {
-  if (!%_ObjectEquals(regexp_key, regexp)) {
+  if (regexp_key !== regexp) {
     regexp_key = regexp;
     regexp_val =
       new GlobalRegExp(
           %_SubString(REGEXP_SOURCE(regexp), 2, REGEXP_SOURCE(regexp).length),
           (REGEXP_IGNORE_CASE(regexp) ? REGEXP_MULTILINE(regexp) ? "im" : "i"
                                       : REGEXP_MULTILINE(regexp) ? "m" : ""));
   }
   return regexp_val;
 }
 
@@ skipping 482 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })