2009-04-30 Maciej Stachowiak <mjs@apple.com>

2009-04-30  Maciej Stachowiak  <mjs@apple.com>

        Reviewed by Geoff Garen.

        - make BaseStrings have themselves as a base, instead of nothing, to remove common branches

        ~0.7% SunSpider speedup

        * runtime/UString.h:
        (JSC::UString::Rep::Rep): For the constructor without a base, set self as base instead of null.
        (JSC::UString::Rep::baseString): Just read m_baseString - no more branching.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43090 268f45cc-cd09-0410-ab3c-d52691b4dbfc