* kjs/object.h: Add a property name constant for "__proto__".
        * kjs/object.cpp: Define it.
	(ObjectImp::get): Use it.
	(ObjectImp::hasProperty): Use it.

	- prepare to turn PropertyMap into a hash table

        * kjs/object.cpp:
	(ObjectImp::mark): Use the new PropertyMap::mark().
	(ObjectImp::put): Use the new overload of PropertyMap::get().
	(ObjectImp::deleteProperty): Use the new overload of PropertyMap::get().
	(ObjectImp::propList): Use PropertyMap::addEnumerablesToReferenceList().

        * kjs/property_map.h: Remove PropertyMapNode and make all node-related methods private.
	Add mark(), a new overload of get() that returns attributes, a clear() that takes no attributes,
	and addEnumerablesToReferenceList().
        * kjs/property_map.cpp:
	(PropertyMap::get): Added new overload.
	(PropertyMap::clear): Added new overload.
	(PropertyMap::mark): Added.
	(PropertyMap::addEnumerablesToReferenceList): Added.

        * kjs/ustring.h: Added a hash function.
        * kjs/ustring.cpp: (KJS::hash): Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2740 268f45cc-cd09-0410-ab3c-d52691b4dbfc