SIGQUIT only reports backtrace for one capability

SIGQUIT is intended to mirror the same signal's functionality provided by the JVM. That is, provide a snapshot of a processes' state in the form of backtraces on stderr. However, GHC's implementation currently only prints a backtrace for a single, arbitrary thread (namely that running via on the main capability). This should be fixed.

Edited Jan 02, 2020 by Ben Gamari

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