Added css jit profiler, disabled by default.
https://bugs.webkit.org/show_bug.cgi?id=134695

Patch by Alex Christensen <achristensen@webkit.org> on 2014-07-08
Reviewed by Benjamin Poulain.

* css/ElementRuleCollector.cpp:
(WebCore::ElementRuleCollector::ruleMatches):
Tell the RuleData when its compiled selector is used.
* css/RuleSet.cpp:
(WebCore::RuleData::RuleData):
Initialize the compiled selector use count to 0.
* css/RuleSet.h:
(WebCore::RuleData::~RuleData):
(WebCore::RuleData::compiledSelectorUsed):
Count and log the number of times a compiled selector is used.
* cssjit/SelectorCompiler.h:
Added option for CSS_SELECTOR_JIT_PROFILING set to 0 by default.
* dom/SelectorQuery.cpp:
(WebCore::SelectorDataList::executeCompiledSimpleSelectorChecker):
(WebCore::SelectorDataList::execute):
Tell the SelectorData when its compiled selector is used.
* dom/SelectorQuery.h:
(WebCore::SelectorDataList::SelectorData::SelectorData):
(WebCore::SelectorDataList::SelectorData::~SelectorData):
(WebCore::SelectorDataList::SelectorData::compiledSelectorUsed):
Count and log the number of times a compiled selector is used.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170894 268f45cc-cd09-0410-ab3c-d52691b4dbfc