Doing so by not letting any events between XXX:enter and XXX:exit
events. This eliminates unnecessary permutations.
Example: 2 threads with 3 enter-exit pairs each would have produced 924
permutations before this, now only 20.
Bug: 120628042
Change-Id: Ia243d273a1d90202011679cc7520ea4c9e43918b
Tests: All tests that use race condition framework
This would guaranteed to repro b/118441555 before it was fixed.
The test doesn't use the most powerful feature of race condition
reproducer, which is enumerating all possible event sequences.
Instead, it uses explicit repro sequences, which makes the test much
faster.
Bug: 120628042
Test: The added test
Change-Id: I89a7a9964f160a8a20ba3d9dda2f248237713014