* trad-core.c: Pass the u.u_ar0 value as the negative of the

* trad-core.c: Pass the u.u_ar0 value as the negative of the
virtual-memory-address of the .reg section.  We can't just make a
section for "all the regs and nothing else" because only GDB knows
exactly where the regs are (scattered around the upage and stack).
Clean up memory allocation.  Remove big- and little-endian
vectors, replace with single vector; this only runs on the host,
in host byte order.  Replace byteswap routines with aborts in case
anyone calls them.
* targets.c:  There's only one trad_core_vec now.
* aoutf1.h (sunos_core_file_p):  VMA of .reg* now needs to be 0.