codeintel: accessor: use a size-based upper bound for binary search
this makes it possible to deal with large documents (more than 64k tokens)

(integrated from komodo (trunk) change 82044 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13654 b87d16e7-d29f-4ee1-b5ec-817d645d335f