Martin Hořeňovský 931441251e Add an early bailout out of benchmark timer calibration ...

Specific platforms (e.g. TDM-GCC) can have terrible timer resolution,
and our checking code will then loop for an inordinate amount of time.
This change will make it so that the calibration gives up after 3
seconds and just uses the already measured values.

This leaves one open question, how to signal that the resolution
is terrible and benchmarking should not happen?

Fixes #1237

2018-04-01 22:50:39 +02:00

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