[Bug 244939] [exp-run] Remove procfs-based process debugging

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244939

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhb
Date: Wed Apr  1 19:22:15 UTC 2020
New revision: 359530
URL: https://svnweb.freebsd.org/changeset/base/359530

Log:
  Retire procfs-based process debugging.

  Modern debuggers and process tracers use ptrace() rather than procfs
  for debugging.  ptrace() has a supserset of functionality available
  via procfs and new debugging features are only added to ptrace().
  While the two debugging services share some fields in struct proc,
  they each use dedicated fields and separate code.  This results in
  extra complexity to support a feature that hasn't been enabled in the
  default install for several years.

  PR:           244939 (exp-run)
  Reviewed by:  kib, mjg (earlier version)
  Relnotes:     yes
  Differential Revision:        https://reviews.freebsd.org/D23837

Changes:
  head/ObsoleteFiles.inc
  head/lib/libsysdecode/Makefile
  head/sys/amd64/amd64/trap.c
  head/sys/amd64/amd64/vm_machdep.c
  head/sys/amd64/ia32/ia32_reg.c
  head/sys/amd64/ia32/ia32_signal.c
  head/sys/amd64/ia32/ia32_syscall.c
  head/sys/arm/arm/syscall.c
  head/sys/arm64/arm64/trap.c
  head/sys/compat/ia32/ia32_sysvec.c
  head/sys/conf/files
  head/sys/fs/procfs/procfs.c
  head/sys/fs/procfs/procfs.h
  head/sys/fs/procfs/procfs_ioctl.c
  head/sys/i386/i386/trap.c
  head/sys/i386/i386/vm_machdep.c
  head/sys/kern/imgact_elf.c
  head/sys/kern/kern_exec.c
  head/sys/kern/kern_exit.c
  head/sys/kern/kern_fork.c
  head/sys/kern/kern_prot.c
  head/sys/kern/kern_sig.c
  head/sys/kern/kern_thread.c
  head/sys/kern/subr_syscall.c
  head/sys/kern/subr_trap.c
  head/sys/kern/sys_process.c
  head/sys/mips/mips/trap.c
  head/sys/modules/procfs/Makefile
  head/sys/powerpc/powerpc/trap.c
  head/sys/riscv/riscv/trap.c
  head/sys/sys/param.h
  head/sys/sys/pioctl.h
  head/sys/sys/proc.h

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