Fix hang when buggy (unaltered) OK comes after STOP #162
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Make sure that we don't proceed when a buggy pass returns an
unmodified file - for this, consistently validate the pass' results on
both codepaths (in process_done_futures() and wait_for_first_success()).
Besides fixing the hang that was possible when a pass misbehaved,
there are a couple of other side effects:
the ones on the first codepath were handled;
codepath allowed a larger reduction to sneak in.
This fixes #156.