- http://bugs.webkit.org/show_bug.cgi?id=16685
          eliminate List::empty() to cut down on PIC branches

        Also included one other speed-up -- remove the call to reserveCapacity from
        FunctionBodyNode::processDeclarations in all but the most unusual cases.

        Together these make SunSpider 1.016x as fast.

        * JavaScriptCore.exp: Updated.
        * kjs/ExecState.cpp:
        (KJS::globalEmptyList): Added. Called only when creating global ExecState
        instances.
        (KJS::ExecState::ExecState): Broke constructor up into three separate functions,
        for the three separate node types. Also went through each of the three and
        streamlined as much as possible, removing dead code. This prevents us from having
        to access the global in the function body version of the constructor.

        * kjs/ExecState.h: Added emptyList(). Replaced the constructor with a set of
        three that are specific to the different node types that can create new execution
        state objects.

        * kjs/array_object.cpp:
        (KJS::ArrayProtoFuncToLocaleString::callAsFunction): Use exec->emptyList() instead
        of List::empty().
        (KJS::ArrayProtoFuncConcat::callAsFunction): Ditto.
        (KJS::ArrayProtoFuncSlice::callAsFunction): Ditto.
        (KJS::ArrayProtoFuncSplice::callAsFunction): Ditto.
        (KJS::ArrayProtoFuncFilter::callAsFunction): Ditto.
        * kjs/function.cpp:
        (KJS::FunctionImp::callAsFunction): Updated to call new ExecState constructor.
        (KJS::GlobalFuncImp::callAsFunction): Ditto (for eval).
        * kjs/function_object.cpp:
        (FunctionObjectImp::construct): Use exec->emptyList() instead of List::empty().

        * kjs/list.cpp: Removed List::empty.
        * kjs/list.h: Ditto.

        * kjs/nodes.cpp:
        (KJS::ElementNode::evaluate): Use exec->emptyList() instead of List::empty().
        (KJS::ArrayNode::evaluate): Ditto.
        (KJS::ObjectLiteralNode::evaluate): Ditto.
        (KJS::PropertyListNode::evaluate): Ditto.
        (KJS::FunctionBodyNode::processDeclarations): Another speed-up. Check the capacity
        before calling reserveCapacity, because it doesn't get inlined the local storage
        vector is almost always big enough -- saving the function call overhead is a big
        deal.
        (KJS::FuncDeclNode::makeFunction): Use exec->emptyList() instead of List::empty().
        (KJS::FuncExprNode::evaluate): Ditto.
        * kjs/object.cpp:
        (KJS::tryGetAndCallProperty): Ditto.
        * kjs/property_slot.cpp:
        (KJS::PropertySlot::functionGetter): Ditto.
        * kjs/string_object.cpp:
        (KJS::StringProtoFuncSplit::callAsFunction): Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@29067 268f45cc-cd09-0410-ab3c-d52691b4dbfc