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[IO] fail hard if the globalCompleter would drop a Future

Florian Fischer requested to merge submit_fail_hard into master

Currently the globalCompleter would drop Futures which he is not able to submit to its SQ because io_uring_submit returned -EBUSY, signalizing a full CQ.

Additional small code changes:

  • don't wrap assert in if constexpr(DEBUG)
  • annotate Future completion in globalCompleter as unlikely
  • use prepared Future count as unsigned
  • remove redundant parenthesis
  • introduce helper function for IoCOntext* tagging For now we fail hard if this hopefully unlikely case occurs.

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