Sped up JavaScript iBench by 6%.

        * kjs/interpreter.h: Removed the level of indirection, and made it all inline.
        * kjs/interpreter.cpp: Removed ExecState implementation from here altogether.

	- fixed an oversight in my sort speedup

        * kjs/array_object.h: Add pushUndefinedObjectsToEnd.
        * kjs/array_object.cpp:
        (ArrayInstanceImp::sort): Call pushUndefinedObjectsToEnd.
        (ArrayInstanceImp::pushUndefinedObjectsToEnd): Added.
	Pushes all undefined to the end of the array.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2738 268f45cc-cd09-0410-ab3c-d52691b4dbfc