swift234

Teach the derived init class 'self' analyzer to look at the refcount result of the
self box as well as the address result, so that it picks up retains and releases.
Classify releases as interesting usepoints, and ignore the dealloc_stack.

Similarly, teach the logic in DefiniteInit's conditional destruction stuff to handle
the derived self case (basically, teaching it to special case the self box).



Swift SVN r21622