Move dfg repatching properties of structure stub info into a union

Reviewed by Oliver Hunt.

We want to be able to have similar properties for the baseline JIT, some restructuring to prepare for this.

* bytecode/StructureStubInfo.h:
(StructureStubInfo):
* dfg/DFGJITCompiler.cpp:
(JSC::DFG::JITCompiler::link):
* dfg/DFGRepatch.cpp:
(JSC::DFG::dfgRepatchByIdSelfAccess):
(JSC::DFG::linkRestoreScratch):
(JSC::DFG::generateProtoChainAccessStub):
(JSC::DFG::tryCacheGetByID):
(JSC::DFG::tryBuildGetByIDList):
(JSC::DFG::tryBuildGetByIDProtoList):
(JSC::DFG::emitPutReplaceStub):
(JSC::DFG::emitPutTransitionStub):
(JSC::DFG::tryCachePutByID):
(JSC::DFG::tryBuildPutByIdList):
(JSC::DFG::dfgResetGetByID):
(JSC::DFG::dfgResetPutByID):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114039 268f45cc-cd09-0410-ab3c-d52691b4dbfc