Fix bug where a KeyError was raised if -O was being used for the interpreter
and Thread.__delete() was called after a Thread instance was created.  Problem
resulted from a currentThread() call in an 'assert' statement being optimized
out and dummy_thread.get_ident() always returning -1 and thus overwriting the
entry for the _MainThread() instance created in 'threading' at import time.

Closes bug #993394.
2 files changed