libc tests: Add some test cases for recursive exiting

Derived from tests posted by kib in D46108. I made one of them use a
pthread barrier instead of sleeping.

Reviewed by: kib
MFC after: 2 weeks

libc tests: Add some test cases for recursive exiting

Derived from tests posted by kib in D46108. I made one of them use a
pthread barrier instead of sleeping.

Reviewed by: kib
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D46176

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libc tests: Rename the quick_exit test file, fix style

Call it libc_exit_test instead of exit_test because the NetBSD test
suite already has a file with the latter name. This is in preparation
for

libc tests: Rename the quick_exit test file, fix style

Call it libc_exit_test instead of exit_test because the NetBSD test
suite already has a file with the latter name. This is in preparation
for adding other exit()-related tests.

MFC after: 2 weeks

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libc: Add a rudimentary test for quick_exit(3).

Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D41937