MFC r351408-r351410: reduce pollution from mips machine/regnum.h

r351408:
libsa: mips: use _JB_* from machine/asm.h, remove regnum dep

This brings the libsa/mips _setjmp implementation closer to pa

MFC r351408-r351410: reduce pollution from mips machine/regnum.h

r351408:
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.

r351409:
mips: hide regnum definitions behind _KERNEL/_WANT_MIPS_REGNUM

machine/regnum.h ends up being included by sys/procfs.h and sys/ptrace.h via
machine/reg.h. Many of the regnum definitions are too short and too generic
to be exposing to any userland application including one of these two
headers. Moreover, these actively cause build failures in googletest
(template <typename T1 ...> expanding to template <typename 9 ...>).

Hide the definitions behind _KERNEL or _WANT_MIPS_REGNUM, and patch all of
the userland consumers to define as needed.

r351410:
libsa: mips: fix typo that had slipped into the diff on local machine

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MFC r350218:

Be consistent about temporary variable use in adjacent loops.

Obtained from: CheriBSD
Sponsored by: DARPA, AFRL

MFC r350158:

Remove an unneeded temporary variable in two functions.

There is no need to convert an intptr_t to a long just to cast it to a
(void *).

Obtained from: CheriBSD
Sponsored by: DARPA, A

MFC r350158:

Remove an unneeded temporary variable in two functions.

There is no need to convert an intptr_t to a long just to cast it to a
(void *).

Obtained from: CheriBSD
Sponsored by: DARPA, AFRL

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