* swank-allegro.lisp (handle-compiler-warning): Ignore "Closure
will be stack allocated" notes.  Those are harmless and there are
too many of them.
(pc-source-location, ldb-code-to-src-loc): Handle case when
excl::ldb-code-pc returns nil.
* swank-lispworks.lisp (frame-package): Implemented.
(function-name-package): New.