TimeCheck: Track waiting through thread join in AudioFlinger
The TimeCheck watchdog is used to diagnose binder stalls. When one occurs, it does a thread-wait analysis, tracking downstream to the ultimate thread the target is blocked on. We add thread join diagnostic tracing in AudioFlinger ThreadBase::exit(). Test: atest CtsMediaAudioTestCases Bug: 328693634 Change-Id: Id633d1371c6aedd111a04510c49e95729a0c7790
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