Reviewers: Mads Ager,

Description:
Land patch by Oleg Eterevsky ([email protected]).

Original review: http://codereview.chromium.org/646010/show

Change the implementation of lastIndexOf method of String. Convert the
strings in question to Vector<char> or Vector<uc16> and execute simple
search algorithm on them.

The difference in speed on 500k character string is about 10x.

[email protected]

Committed: http://code.google.com/p/v8/source/detail?r=3922

Please review this at http://codereview.chromium.org/650036

Affected files:
  M src/runtime.cc


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