NetBSD / src / kWvMBaI / - When forking, use own register stack for each thread

NetBSD/src kWvMBaI — sys/arch/ia64/ia64 vm_machdep.c machdep.c, sys/arch/ia64/include proc.h md_var.h

   - When forking, use own register stack for each thread
   - For UAREA, arrange layout same as FreeBSD for now to hopefully
     ease porting woes.  add some related macros
     locore.S is incorrectly assuming same layout and seems painful
     to change bspstore in startup
   - use ia64_init_return same as FreeBSD
   - change some "printf" to "panic" for incompleted items

   context switching is still broken but maybe less so

Version	Delta		File
1.15	+42	-20	sys/arch/ia64/ia64/vm_machdep.c
1.39	+18	-28	sys/arch/ia64/ia64/machdep.c
1.7	+21	-1	sys/arch/ia64/include/proc.h
1.8	+17	-1	sys/arch/ia64/ia64/locore.S
1.3	+10	-2	sys/arch/ia64/include/md_var.h
1.7	+5	-5	sys/arch/ia64/ia64/syscall.c
	+113	-57	6 files

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