Removed ReplaceResultBuilder.

src/string.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 477 matching lines @@
         // elem must be an Array.
         // Use the apply argument as backing for global RegExp properties.
         lastMatchInfoOverride = elem;
         var func_result = %Apply(replace, receiver, elem, 0, elem.length);
         // Overwrite the i'th element in the results with the string we got
         // back from the callback function.
         res[i] = TO_STRING_INLINE(func_result);
       }
     }
   }
-  var resultBuilder = new ReplaceResultBuilder(subject, res);
-  var result = resultBuilder.generate();
+  var result = %StringBuilderConcat(res, res.length, subject);
   resultArray.length = 0;
   reusableReplaceArray = resultArray;
   return result;
 }
 
 
 function StringReplaceNonGlobalRegExpWithFunction(subject, regexp, replace) {
   var matchInfo = DoRegExpExec(regexp, subject, 0);
   if (IS_NULL(matchInfo)) {
     regexp.lastIndex = 0;
@@ skipping 433 matching lines @@
 
 function StringSub() {
   return "<sub>" + this + "</sub>";
 }
 
 
 function StringSup() {
   return "<sup>" + this + "</sup>";
 }
 
-
-// ReplaceResultBuilder support.
-function ReplaceResultBuilder(str) {
-  if (%_ArgumentsLength() > 1) {
-    this.elements = %_Arguments(1);
-  } else {
-    this.elements = new InternalArray();
-  }
-  this.special_string = str;
-}
-
-SetUpLockedPrototype(ReplaceResultBuilder,
-  $Array("elements", "special_string"), $Array(
-  "add", function(str) {
-    str = TO_STRING_INLINE(str);
-    if (str.length > 0) this.elements.push(str);
-  },
-  "addSpecialSlice", function(start, end) {
-    var len = end - start;
-    if (start < 0 || len <= 0) return;
-    if (start < 0x80000 && len < 0x800) {
-      this.elements.push((start << 11) | len);
-    } else {
-      // 0 < len <= String::kMaxLength and Smi::kMaxValue >= String::kMaxLength,
-      // so -len is a smi.
-      var elements = this.elements;
-      elements.push(-len);
-      elements.push(start);
-    }
-  },
-  "generate", function() {
-    var elements = this.elements;
-    return %StringBuilderConcat(elements, elements.length, this.special_string);
-  }
-));
-
-
 // -------------------------------------------------------------------
 
 function SetUpString() {
   %CheckIsBootstrapping();
 
   // Set the String function and constructor.
   %SetCode($String, StringConstructor);
   %FunctionSetPrototype($String, new $String());
 
   // Set up the constructor property on the String prototype object.
@@ skipping 38 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();