Reviewed by Eric Seidel.

        Make HTML5Lexer go fast
        https://bugs.webkit.org/show_bug.cgi?id=40048

        We're going to do this patch in small steps to make it easier to verify correctness.

        * html/HTML5Lexer.cpp:
        (WebCore::HTML5Lexer::nextToken):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60694 268f45cc-cd09-0410-ab3c-d52691b4dbfc