Change StringSearch to not call exec and build unnecessary intermediate array.

Review URL: http://codereview.chromium.org/1223006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4259 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/string.js

@@ -525,14 +525,12 @@ function ApplyReplacementFunction(replace, matchInfo, subject) {
 function StringSearch(re) { 
   var regexp = new $RegExp(re);
   var s = TO_STRING_INLINE(this);
-  var last_idx = regexp.lastIndex; // keep old lastIndex
-  regexp.lastIndex = 0;            // ignore re.global property
-  var result = regexp.exec(s);
-  regexp.lastIndex = last_idx;     // restore lastIndex
-  if (result == null)
+  var match = DoRegExpExec(regexp, s, 0);
+  if (match) {
+    lastMatchInfo = match;
+    return match[CAPTURE0];
+  }
   return -1;
-  else
-    return result.index;
 }