i#3346 trace exit: avoid deadlock in check_in_last_thread_vm_area #3350
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Removes the lock acquisition from check_in_last_thread_vm_area to
avoid deadlock. The scenario we're trying to catch will read and
match with no extra lock due to the bb building lock.
It would be nice to have a test but it is not easy to write due to the
race that needs to be arranged.
Issue: #3346