Reviewed by Oliver.
        
        - reduce function call overhead for 1.014x speedup on SunSpider

        I moved some functions from ExecState.cpp to ExecStateInline.h and
        from JSGlobalObject.cpp to JSGlobalObject.h, and declared them
        inline; machine function call overhead for these was hurting JS
        funcion call overhead.
        
        * kjs/ExecState.cpp:
        * kjs/ExecStateInlines.h: Added.
        (KJS::ExecState::ExecState):
        (KJS::ExecState::~ExecState):
        (KJS::FunctionExecState::FunctionExecState):
        (KJS::FunctionExecState::~FunctionExecState):
        * kjs/JSGlobalObject.cpp:
        * kjs/JSGlobalObject.h:
        (KJS::JSGlobalObject::pushActivation):
        (KJS::JSGlobalObject::checkActivationCount):
        (KJS::JSGlobalObject::popActivation):
        * kjs/function.cpp:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31173 268f45cc-cd09-0410-ab3c-d52691b4dbfc