screen update problems (particularly on the pmax, sparc and alpha,
and i386 to a lesser extent). It seems that because __LDATA wasn't a
fully packed structure (and hashes to check for screen updates hashed
unused areas in the structure as well) that under some circumstances the
compiler filled the unused areas with garbage.
Doesn't break binary compatibiliy - no shared library version number
changes.
dc3d23b724