fixes issue 463 + hashtable_add lookup is done while internal-synch lock is held
fixes issue 463
+ hashtable_add lookup is done while internal-synch lock is held

git-svn-id: ed337ca7cdb08c0ba29d8fe58632bb7686892c2d@795 49cc7528-f6fd-11dd-9d1a-b59b2e1864b6

rnk/dynamorio,rnk/dynamorio,rnk/dynamorio,rnk/dynamorio,rnk/dynamorio