Reviewed by Oliver Hunt.

        Make get_by_id/put_by_id/method_check/call defer optimization using a data flag rather than a code modification.
        ( https://bugs.webkit.org/show_bug.cgi?id=27635 )

        This improves performance of ENABLE(ASSEMBLER_WX_EXCLUSIVE) builds by 2-2.5%, reducing the overhead to about 2.5%.
        (No performance impact with ASSEMBLER_WX_EXCLUSIVE disabled).

        * bytecode/CodeBlock.cpp:
        (JSC::printStructureStubInfo):
            - Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

        * bytecode/CodeBlock.h:
        (JSC::):
        (JSC::CallLinkInfo::seenOnce):
        (JSC::CallLinkInfo::setSeen):
        (JSC::MethodCallLinkInfo::seenOnce):
        (JSC::MethodCallLinkInfo::setSeen):
            - Change a pointer in CallLinkInfo/MethodCallLinkInfo to use a PtrAndFlags, use a flag to track when an op has been executed once.

        * bytecode/StructureStubInfo.cpp:
        (JSC::StructureStubInfo::deref):
            - Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

        * bytecode/StructureStubInfo.h:
        (JSC::StructureStubInfo::StructureStubInfo):
        (JSC::StructureStubInfo::initGetByIdSelf):
        (JSC::StructureStubInfo::initGetByIdProto):
        (JSC::StructureStubInfo::initGetByIdChain):
        (JSC::StructureStubInfo::initGetByIdSelfList):
        (JSC::StructureStubInfo::initGetByIdProtoList):
        (JSC::StructureStubInfo::initPutByIdTransition):
        (JSC::StructureStubInfo::initPutByIdReplace):
        (JSC::StructureStubInfo::seenOnce):
        (JSC::StructureStubInfo::setSeen):
            - Make StructureStubInfo store the type as an integer, rather than an OpcodeID, add a flag to track when an op has been executed once.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitGetById):
        (JSC::BytecodeGenerator::emitPutById):
            - Make StructureStubInfo store the type as an integer, rather than an OpcodeID.

        * jit/JIT.cpp:
        (JSC::JIT::privateCompileCTIMachineTrampolines):
        (JSC::JIT::unlinkCall):
            - Remove the "don't lazy link" stage of calls.

        * jit/JIT.h:
        (JSC::JIT::compileCTIMachineTrampolines):
            - Remove the "don't lazy link" stage of calls.

        * jit/JITCall.cpp:
        (JSC::JIT::compileOpCallSlowCase):
            - Remove the "don't lazy link" stage of calls.

        * jit/JITStubs.cpp:
        (JSC::JITThunks::JITThunks):
        (JSC::JITThunks::tryCachePutByID):
        (JSC::JITThunks::tryCacheGetByID):
        (JSC::JITStubs::DEFINE_STUB_FUNCTION):
        (JSC::JITStubs::getPolymorphicAccessStructureListSlot):
            - Remove the "don't lazy link" stage of calls, and the "_second" stage of get_by_id/put_by_id/method_check.

        * jit/JITStubs.h:
        (JSC::JITThunks::ctiStringLengthTrampoline):
        (JSC::JITStubs::):
            - Remove the "don't lazy link" stage of calls, and the "_second" stage of get_by_id/put_by_id/method_check.

        * wtf/PtrAndFlags.h:
        (WTF::PtrAndFlags::PtrAndFlags):
        (WTF::PtrAndFlags::operator!):
        (WTF::PtrAndFlags::operator->):
            - Add ! and -> operators, add constuctor with pointer argument.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@46618 268f45cc-cd09-0410-ab3c-d52691b4dbfc