K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-08-22T21:42:11.960417Z
K 7
svn:log
V 251
libsa: mips: use _JB_* from machine/asm.h, remove regnum dep

This brings the libsa/mips _setjmp implementation closer to parity with the
libc version.

Reviewed by:	imp, jhb
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D21330

END