Handle methods being present in multiple threads correctly

We were incorrectly removing obsolete methods from the jit too early.
This could cause stack walking to fail on other threads that also have
the same method present. This changes so we will not notify the jit of
obsoleted methods until we have walked all threads.

Test: ./test.py --host
Bug: 73333076
Change-Id: I30b1293eaf2dac7d4af858f77e5819af2d96b429
(cherry picked from commit 46327c195797d18337e83c74153d070232959425)