Experimental Profiler: tweak type info threshold.

src/string.js

 // Copyright 2006-2009 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 536 matching lines @@
     end_i = TO_INTEGER(end);
   }
 
   if (start_i < 0) {
     start_i += s_len;
     if (start_i < 0) {
       start_i = 0;
     }
   } else {
     if (start_i > s_len) {
-      start_i = s_len;
+      return '';
     }
   }
 
   if (end_i < 0) {
     end_i += s_len;
     if (end_i < 0) {
-      end_i = 0;
+      return '';
     }
   } else {
     if (end_i > s_len) {
       end_i = s_len;
     }
   }
 
-  var num_c = end_i - start_i;
-  if (num_c < 0) {
-    num_c = 0;
+  if (end_i <= start_i) {
+    return '';
   }
 
-  return SubString(s, start_i, start_i + num_c);
+  return SubString(s, start_i, end_i);
 }
 
 
 // ECMA-262 section 15.5.4.14
 function StringSplit(separator, limit) {
   if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
     throw MakeTypeError("called_on_null_or_undefined",
                         ["String.prototype.split"]);
   }
   var subject = TO_STRING_INLINE(this);
@@ skipping 417 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();