Store fewer arrays in the context snapshot.

src/string.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.
 
 var $stringCharAt;
 var $stringIndexOf;
 var $stringSubstring;
 
 (function(global, shared, exports) {
 
@@ skipping 152 matching lines @@
     if (result !== null) $regexpLastMatchInfoOverride = null;
     regexp.lastIndex = 0;
     return result;
   }
   // Non-regexp argument.
   regexp = new GlobalRegExp(regexp);
   return $regexpExecNoTests(regexp, subject, 0);
 }
 
 
-var NORMALIZATION_FORMS = ['NFC', 'NFD', 'NFKC', 'NFKD'];
-
-
 // ECMA-262 v6, section 21.1.3.12
 //
 // For now we do nothing, as proper normalization requires big tables.
 // If Intl is enabled, then i18n.js will override it and provide the the
 // proper functionality.
 function StringNormalizeJS(form) {
   CHECK_OBJECT_COERCIBLE(this, "String.prototype.normalize");
 
   var form = form ? TO_STRING_INLINE(form) : 'NFC';
+
+  var NORMALIZATION_FORMS = ['NFC', 'NFD', 'NFKC', 'NFKD'];
+
   var normalizationForm = NORMALIZATION_FORMS.indexOf(form);
   if (normalizationForm === -1) {
     throw MakeRangeError(kNormalizationForm, NORMALIZATION_FORMS.join(', '));
   }
 
   return %_ValueOf(this);
 }
 
 
 // This has the same size as the $regexpLastMatchInfo array, and can be used
@@ skipping 208 matching lines @@
   // If start isn't valid, return undefined.
   if (start < 0) return;
   var end = lastCaptureInfo[CAPTURE(scaled + 1)];
   return %_SubString(string, start, end);
 }
 
 
 // TODO(lrn): This array will survive indefinitely if replace is never
 // called again. However, it will be empty, since the contents are cleared
 // in the finally block.
-var reusableReplaceArray = new InternalArray(16);
+var reusableReplaceArray = new InternalArray(4);
 
 // Helper function for replacing regular expressions with the result of a
 // function application in String.prototype.replace.
 function StringReplaceGlobalRegExpWithFunction(subject, regexp, replace) {
   var resultArray = reusableReplaceArray;
   if (resultArray) {
     reusableReplaceArray = null;
   } else {
     // Inside a nested replace (replace called from the replacement function
     // of another replace) or we have failed to set the reusable array
@@ skipping 746 matching lines @@
   "strike", StringStrike,
   "sub", StringSub,
   "sup", StringSup
 ]);
 
 $stringCharAt = StringCharAtJS;
 $stringIndexOf = StringIndexOfJS;
 $stringSubstring = StringSubstring;
 
 })