[issue13481] Use an accurate clock in timeit

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

> Are CLOCK_MONOTONIC_RAW, CLOCK_MONOTONIC and CLOCK_REALTIME more accurate than gettimeofday (time.time)?

Actually, on Linux gettimeofday() returns CLOCK_REALTIME.
As for CLOCK_MONOTONIC{_RAW}, they're guaranteed not to go backward
(NTP and such).
But I think Antoine was referring to CPU time vs wall clock time (but
see comments above while this is probably a bad idea).

> I think this should be rejected.

Agreed.

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