Avoid bailing out to runtime for short substrings.
This significantly improves the speed for creating short substrings (less than 13 characters) from slices, flat cons strings and external strings. TEST=string-external-cached.js, string-slices.js Review URL: http://codereview.chromium.org/8889012 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10221 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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