increases when accessing very high index value in array

	The two missing pieces were handling sparse properties when
	shrinking the array, and when sorting. Thse are now both taken
	care of.

        * kjs/array_instance.h:
        * kjs/array_object.cpp:
        (ArrayInstanceImp::put):
        (ArrayInstanceImp::deleteProperty):
        (ArrayInstanceImp::resizeStorage):
        (ArrayInstanceImp::setLength):
        (ArrayInstanceImp::sort):
        (ArrayInstanceImp::pushUndefinedObjectsToEnd):
        * kjs/identifier.h:
        * kjs/object.h:
        * kjs/property_map.cpp:
        * kjs/property_map.h:
        * kjs/reference_list.cpp:
        (ReferenceList::append):
        (ReferenceList::length):
        * kjs/reference_list.h:
        * kjs/ustring.cpp:
        (UString::toUInt32):
        * kjs/ustring.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2846 268f45cc-cd09-0410-ab3c-d52691b4dbfc