[Bug bpf/25218] stapbpf loses perf_events when writing to interactive terminal

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=25218

--- Comment #2 from Serhei Makarov <me at serhei dot io> ---
One thing that I should definitely fix, aside from tackling the speed disparity
in console/file output: when perf_events are lost, unpaired PRINTF_{START,END}
messages should not cause a fatal error for stapbpf.

That is, a sequence such as

PRINTF_START PRINTF_END <lost events> PRINTF_END

should cause the PRINTF_END to be dropped along with the lost events.
Currently it causes stapbpf to terminate with an error message.

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