[lldb] Release output lock across blocking el_wgetc in DisplayCompletions (#196686) DisplayCompletions held m_output_stream_sp->Lock() across the blocking el_wgetc() call used by the "More (Y/n/a)" pager. Because the lock is a recursive_mutex, this worked when Editline::Interrupt() ran on the same thread (the synchronous SIGINT handler), but deadlocks when Interrupt() runs on another thread: it blocks on the lock and can never call InterruptRead() to wake the editor thread. Mirror the pattern already used by Editline::GetCharacter: drop the lock across the blocking read and reacquire it afterward. The status check and the "^C\n" / "\n" prints stay under the lock.
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