libthr: drop use of try_gc in the end of thr_joinHEADmain

thr_try_gc unlock and lock again to make sure the lock order. However,
there is no reason for such roundtrip if the caller holds the correct
oder. As a result, we create a new helper function to add the thread
to gc list without unlock + lock and wire the join_common to this new helper.

Reviewed by:    kib
MFC after:      2 weeks
Differential Revision: https://reviews.freebsd.org/D60717

0 files changed, 0 insertions, 0 deletions