Konstantin Belousov f9bf9282c9 Fix destruction of the robust mutexes.
If robust mutex' owner terminated, causing kernel-assisted state
recovery, and then pthread_mutex_destroy() is executed as the next
action, assert is triggered about mutex still being on the list.
Ignore the mutex linkage in pthread_mutex_destroy() for shared robust
mutexes with dead owner, same as for enqueue_mutex().

Reported by:	avg
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-09-23 13:24:31 +00:00
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