https://bugs.webkit.org/show_bug.cgi?id=82077

Reviewed by Oliver Hunt.

This change simplifies matching, and will enable subpattern results to be fully lazily generated in the future.

This patch changes the scheme used to lazily generate the last match properties of the RegExp object.
Instead of relying on the results in the ovector, we can instead lazily generate the subpatters using
a RegExpMatchesArray. To do so we just need to store the input, the regexp matched, and the match
location (the MatchResult). When the match is accessed or the input is set, we reify results. We use
a special value of setting the saved result to MatchResult::failed() to indicated that we're in a
reified state. This means that next time a match is performed, the store of the result will
automatically blow away the reified value.

* JavaScriptCore.xcodeproj/project.pbxproj:
    - Added new files.
* runtime/RegExp.cpp:
(JSC::RegExpFunctionalTestCollector::outputOneTest):
    - changed 'subPattern' -> 'subpattern' (there was a mix in JSC, 'subpattern' was more common).
* runtime/RegExpCachedResult.cpp: Added.
(JSC::RegExpCachedResult::visitChildren):
(JSC::RegExpCachedResult::lastResult):
(JSC::RegExpCachedResult::setInput):
    - New methods, mark GC objects, lazily create the matches array, and record a user provided input (via assignment to RegExp.inupt).
* runtime/RegExpCachedResult.h: Added.
(RegExpCachedResult):
    - Added new class.
(JSC::RegExpCachedResult::RegExpCachedResult):
(JSC::RegExpCachedResult::record):
(JSC::RegExpCachedResult::input):
    - Initialize the object, record the result of a RegExp match, access the stored input property.
* runtime/RegExpConstructor.cpp:
(JSC::RegExpConstructor::RegExpConstructor):
    - Initialize m_result/m_multiline properties.
(JSC::RegExpConstructor::visitChildren):
    - Make sure the cached results (or lazy source for them) are marked.
(JSC::RegExpConstructor::getBackref):
(JSC::RegExpConstructor::getLastParen):
(JSC::RegExpConstructor::getLeftContext):
(JSC::RegExpConstructor::getRightContext):
    - Moved from RegExpConstructor, moved to RegExpCachedResult, and using new caching scheme.
(JSC::regExpConstructorInput):
(JSC::setRegExpConstructorInput):
    - Changed to use RegExpCachedResult.
* runtime/RegExpConstructor.h:
(JSC::RegExpConstructor::create):
(RegExpConstructor):
(JSC::RegExpConstructor::setMultiline):
(JSC::RegExpConstructor::multiline):
    - Move multiline property onto the constructor object; it is not affected by the last match.
(JSC::RegExpConstructor::setInput):
(JSC::RegExpConstructor::input):
    - These defer to RegExpCachedResult.
(JSC::RegExpConstructor::performMatch):
* runtime/RegExpMatchesArray.cpp: Added.
(JSC::RegExpMatchesArray::visitChildren):
    - Eeeep! added missing visitChildren!
(JSC::RegExpMatchesArray::finishCreation):
(JSC::RegExpMatchesArray::reifyAllProperties):
(JSC::RegExpMatchesArray::reifyMatchProperty):
    - Moved from RegExpConstructor.cpp.
(JSC::RegExpMatchesArray::leftContext):
(JSC::RegExpMatchesArray::rightContext):
    - Since the match start/
* runtime/RegExpMatchesArray.h:
(RegExpMatchesArray):
    - Declare new methods & structure flags.
* runtime/RegExpObject.cpp:
(JSC::RegExpObject::match):
    - performMatch now requires the JSString input, to cache.
* runtime/StringPrototype.cpp:
(JSC::removeUsingRegExpSearch):
(JSC::replaceUsingRegExpSearch):
(JSC::stringProtoFuncMatch):
(JSC::stringProtoFuncSearch):
    - performMatch now requires the JSString input, to cache.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111889 268f45cc-cd09-0410-ab3c-d52691b4dbfc