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This patch improves the synchronization of the debugger's output and error streams using two new abstractions: `LockableStreamFile` and `LockedStreamFile`. - `LockableStreamFile` is a wrapper around a `StreamFile` and a mutex. Client cannot use the `StreamFile` without calling `Lock`, which returns a `LockedStreamFile`. - `LockedStreamFile` is an RAII object that locks the stream for the duration of its existence. As long as you hold on to the returned object you are permitted to write to the stream. The destruction of the object automatically flush the output stream.