* findvar.c (supply_register): Add CLEAN_UP_REGISTER_VALUE hook.

* findvar.c (supply_register):  Add CLEAN_UP_REGISTER_VALUE hook.
* tm-hppa.h (CLEAN_UP_REGISTER_VALUE):  Use it.
* hppa-coredep.c:  Remove, now that we use the hook.
* config/hppab.mh, config/hppah.mh:  Use standard coredep.o.
* hppab-xdep.c, hppah-xdep.c:  Remove custom code, use hook.

* dbxread.c, partial-stab.h:  Replace all #ifdef hp9000s800's with
GDB_TARGET_IS_HPPA's.  This is a SERIOUS KLUDGE.  The code needs to all
be ripped out and reimplemented right (see elfread.c).
* tm-hppa.h (GDB_TARGET_IS_HPPA):  Define.