RFA: handle zero-length types in value_from_register

[Jim Blandy]

The patches I posted here:

http://sources.redhat.com/ml/gdb-patches/2004-01/msg00717.html

haven't gotten any more comments since my last revision, so I've
committed them.

2004-02-17  Jim Blandy  <jimb@redhat.com>

	* findvar.c (value_from_register): If the type has no length, just
	return an acceptable value --- don't report an internal error.

	* stabsread.c (read_type): If we find any type numbers that are
	forward references, complain if the references aren't resolved by
	the time we're finished reading.
	(cleanup_undefined_types): Make error message more appropriate for
	a complaint.