Unlock suspend count lock before dumping threads

We're seeing apparent deadlocks on thread_suspend_count_lock_
when failing to suspend a thread. These do not appear to be real
since thread_suspend_cound_lock_ is only briefly held here. By
releasing the lock before dumping threads and crashing, we
hope to get better information on where we're actually stuck.

Test: Treehugger
Bug: 203363895
Change-Id: I68879cfc6f527c702831b0dfd407b432d10c39c8
1 file changed