Use the Selector Code Generator for matching in SelectorQuery

https://bugs.webkit.org/show_bug.cgi?id=126185

Reviewed by Ryosuke Niwa.

Source/WebCore: 

Compile selectors on demand and use the generated binary to perform
element matching in SelectorQuery.

Tests: fast/selectors/querySelector-long-adjacent-backtracking.html
       fast/selectors/querySelector-long-child-backtracking.html
       fast/selectors/querySelector-mixed-child-adjacent-backtracking.html
       fast/selectors/querySelector-multiple-simple-child-backtracking.html
       fast/selectors/querySelector-simple-adjacent-backtracking.html
       fast/selectors/querySelector-simple-child-backtracking.html

* dom/SelectorQuery.cpp:
(WebCore::SelectorDataList::executeCompiledSimpleSelectorChecker):
(WebCore::SelectorDataList::executeCompiledSelectorCheckerWithContext):
(WebCore::SelectorDataList::execute):
* dom/SelectorQuery.h:

LayoutTests: 

Add some tests for longer backtracking cases typically not covered by the other tests.

* fast/selectors/querySelector-long-adjacent-backtracking-expected.txt: Added.
* fast/selectors/querySelector-long-adjacent-backtracking.html: Added.
* fast/selectors/querySelector-long-child-backtracking-expected.txt: Added.
* fast/selectors/querySelector-long-child-backtracking.html: Added.
* fast/selectors/querySelector-mixed-child-adjacent-backtracking-expected.txt: Added.
* fast/selectors/querySelector-mixed-child-adjacent-backtracking.html: Added.
* fast/selectors/querySelector-multiple-simple-child-backtracking-expected.txt: Added.
* fast/selectors/querySelector-multiple-simple-child-backtracking.html: Added.
* fast/selectors/querySelector-simple-adjacent-backtracking-expected.txt: Added.
* fast/selectors/querySelector-simple-adjacent-backtracking.html: Added.
* fast/selectors/querySelector-simple-child-backtracking-expected.txt: Added.
* fast/selectors/querySelector-simple-child-backtracking.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161839 268f45cc-cd09-0410-ab3c-d52691b4dbfc