Reviewed by Gavin Barraclough.

        Speed up getter performance in the jit
        https://bugs.webkit.org/show_bug.cgi?id=35332

        Implement getter lookup caching in the interpreter.
        The getter stubs are generated through basically the
        same code paths as the normal get_by_id caching.
        Instead of simply loading a property and returning,
        we load the getter slot, and pass the getter, base value
        and return address to a shared stub used for getter
        dispatch.

        * jit/JIT.h:
        (JSC::JIT::compileGetByIdProto):
        (JSC::JIT::compileGetByIdSelfList):
        (JSC::JIT::compileGetByIdProtoList):
        (JSC::JIT::compileGetByIdChainList):
        (JSC::JIT::compileGetByIdChain):
        * jit/JITPropertyAccess.cpp:
        (JSC::JIT::privateCompileGetByIdProto):
        (JSC::JIT::privateCompileGetByIdSelfList):
        (JSC::JIT::privateCompileGetByIdProtoList):
        (JSC::JIT::privateCompileGetByIdChainList):
        (JSC::JIT::privateCompileGetByIdChain):
        * jit/JITPropertyAccess32_64.cpp:
        (JSC::JIT::privateCompileGetByIdProto):
        (JSC::JIT::privateCompileGetByIdSelfList):
        (JSC::JIT::privateCompileGetByIdProtoList):
        (JSC::JIT::privateCompileGetByIdChainList):
        (JSC::JIT::privateCompileGetByIdChain):
        * jit/JITStubs.cpp:
        (JSC::JITThunks::tryCacheGetByID):
        (JSC::DEFINE_STUB_FUNCTION):
        * jit/JITStubs.h:
        (JSC::):
        * runtime/GetterSetter.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55185 268f45cc-cd09-0410-ab3c-d52691b4dbfc