i#1054: Ignore curiosity reporting locks that have been deleted once

Curiosities during exit no longer trigger the locks_not_closed()
assertion with this change.

Fixes issue 1054.

Review URL: https://codereview.appspot.com/7129051

git-svn-id: https://dynamorio.googlecode.com/svn/trunk@1832 49cc7528-f6fd-11dd-9d1a-b59b2e1864b6