MFCr350612
procdesc: fix reparenting when the debugger is attached

The process is reparented to the debugger while it is attached.
B B
/ ----> |
A A D

Every tim

MFCr350612
procdesc: fix reparenting when the debugger is attached

The process is reparented to the debugger while it is attached.
B B
/ ----> |
A A D

Every time when the process is reparented, it is added to the orphan list
of the previous parent:

A->orphan = B
D->orphan = NULL

When the A process will close the process descriptor to the B process,
the B process will be reparented to the init process.
B B - init
| ---->
A D A D

A->orphan = B
D->orphan = B

In this scenario, the B process is in the orphan list of A and D.

When the last process descriptor is closed instead of reparenting
it to the reaper let it stay with the debugger process and set
our previews parent to the reaper.

Add test case for this situation.
Notice that without this patch the kernel will crash with this test case:
panic: orphan 0xfffff8000e990530 of 0xfffff8000e990000 has unexpected oppid 1

Reviewed by: markj, kib
Differential Revision: https://reviews.freebsd.org/D20361

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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 r351211:
sys.kern.pdeathsig.signal_delivered_ptrace: fix startup.

PR: 237657

MFC r351210:
sys.kern.pdeathsig.signal_delivered_ptrace: fix debugger detach

PR: 237657

MFC r345034:

Drop "All rights reserved" from the files I own

Also, add SPDX tags where needed.