https://bugs.webkit.org/show_bug.cgi?id=126176

Source/JavaScriptCore: 

Reviewed by Antti Koivisto and Oliver Hunt.

Add test and branch based on BaseIndex addressing for x86_64.
Fast loops are needed to compete with clang on tight loops.

* assembler/MacroAssembler.h:
* assembler/MacroAssemblerX86_64.h:
(JSC::MacroAssemblerX86_64::branch64):
(JSC::MacroAssemblerX86_64::branchPtr):
* assembler/X86Assembler.h:
(JSC::X86Assembler::cmpq_rm):

Source/WebCore: 

Reviewed by Antti Koivisto.

Add selector matching based on classname to the Selector Compiler.

* cssjit/SelectorCompiler.cpp:
(WebCore::SelectorCompiler::SelectorCodeGenerator::SelectorCodeGenerator):
(WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementDataMatching):
(WebCore::SelectorCompiler::SelectorCodeGenerator::generateElementHasClasses):
* dom/ElementData.h:
(WebCore::ElementData::classNamesMemoryOffset):
* dom/SpaceSplitString.h:
(WebCore::SpaceSplitStringData::sizeMemoryOffset):
(WebCore::SpaceSplitStringData::tokensMemoryOffset):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161031 268f45cc-cd09-0410-ab3c-d52691b4dbfc