* i386nbsd-tdep.c: Include "trad-frame.h" and "tramp-frame.h"
	(sigtramp_retcode, i386nbsd_sigtramp_offset, i386nbsd_sigtramp_p):
	Remove
	(i386nbsd_mc_reg_offset): New array.
	(i386nbsd_sigtramp_cache_init): New function.
	(i386nbsd_sigtramp_sc16, i386nbsd_sigtramp_sc2, i386nbsd_sigtramp_si2)
	(i386nbsd_sigtramp_si31, i386nbsd_sigtramp_si4): New signal trampoline
	frame descriptions.
	(i386nbsd_init_abi): Override ABI sigcontext defaults and register
	new signal frame unwinders
	* Makefile.in (i386nbsd-tdep.o): Update dependencies.
	* tramp-frame.h (struct tramp_frame): Allow for 48 instructions