Mehdi Mulani 1f9fc0ee3a Stop CxxBridge run loop when bridge is invalidated
Summary:
This fixes the `testModulesAreDeallocated` test. It was sometimes failing because the bridge's module was still alive. I debugged with the Xcode memory graph and found that the bridge was actually kept alive by a pointer from the NSThread.
By killing the runloop on the thread, the thread will eventually die and thus free the bridge.

One thing I didn't investigate was whether the thread was alive because of it receiving actual messages or just because the run loop was spinning.

Reviewed By: javache

Differential Revision: D5729925

fbshipit-source-id: 304f526129d2c5e137bfd791a6f957f6169b783e
2017-08-30 09:46:31 -07:00
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