DCHECK on reentrant invocations of loop()
Summary: I had a crash bug where an `EventBase` handler called a function, which tried to use the thread's EventBase as if it were its own: ``` auto evb = folly::EventBaseManager::get()->getEventBase(); // schedule work on evb, which calls evb->terminateLoopSoon() on completion evb->loopForever(); ``` This ended up invoking the `event_base_loop()` reentrantly, and corrupting the heap in a hard-to-debug way. Reviewed By: djwatson Differential Revision: D3408155 fbshipit-source-id: b8855aa3b390fa33e032ab295d386122d2cb872a
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