Reviewed by Oliver Hunt.

        Incorrect backtracking for nested alternatives
        https://bugs.webkit.org/show_bug.cgi?id=52387

        Added tests to verfiy backtracking of alternatives following 
        parenthesis.

        * fast/regex/parentheses-expected.txt:
        * fast/regex/script-tests/parentheses.js:
2011-01-14  Michael Saboff  <msaboff@apple.com>

        Reviewed by Oliver Hunt.

        Incorrect backtracking for nested alternatives
        https://bugs.webkit.org/show_bug.cgi?id=52387

        In the process of propigating a datalabel it wasn't getting connected
        to a destination when the destination was an indirect jump.  Added
        code to recognize a direct backtrack destination that was an indirect
        jump and added mechanism to associate DataLabelPtrs with indirect
        jump entries.
        Removed dead method
        BacktrackDestination::linkDataLabelToHereIfExists()

        * yarr/YarrJIT.cpp:
        (JSC::Yarr::YarrGenerator::IndirectJumpEntry::IndirectJumpEntry):
        (JSC::Yarr::YarrGenerator::IndirectJumpEntry::addDataLabel):
        (JSC::Yarr::YarrGenerator::GenerationState::addIndirectJumpEntry):
        (JSC::Yarr::YarrGenerator::GenerationState::emitIndirectJumpTable):
        Changes to link indirect jumps with DataLabelPtr's.
        (JSC::Yarr::YarrGenerator::BacktrackDestination::clearSubDataLabelPtr):
        (JSC::Yarr::YarrGenerator::TermGenerationState::linkDataLabelToBacktrackIfExists): 
        Updated to handle immediate linking of indirect jumps to
        DataLabelPtr.
        (JSC::Yarr::YarrGenerator::generateParenthesesDisjunction): Changed to
        reflect updated linkDataLabelToBacktrackIfExists().


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75796 268f45cc-cd09-0410-ab3c-d52691b4dbfc