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.
* trad-core.c: Document how to use it nowadays.
* i386aout.c, newsos3.c: Clean up.
* i386coff.c: Allow 386 coff files to be used as core files too
(for reading core files from embedded systems).
