[binutils-gdb/gdb-8.0-branch] PR threads/20743: Don't attempt to suspend or resume exited threads.

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 24b03ea864424cf8482ba07fb074389aa759e592 ***

Author: John Baldwin <jhb@FreeBSD.org>
Branch: gdb-8.0-branch
Commit: 24b03ea864424cf8482ba07fb074389aa759e592

PR threads/20743: Don't attempt to suspend or resume exited threads.

When resuming a native FreeBSD process, ignore exited threads when
suspending/resuming individual threads prior to continuing the process.

gdb/ChangeLog:

	PR threads/20743
	* fbsd-nat.c (resume_one_thread_cb): Remove.
	(resume_all_threads_cb): Remove.
	(fbsd_resume): Use ALL_NON_EXITED_THREADS instead of
	iterate_over_threads.