Mark Pizzolato 3a9a15f3a9 TIMER: Allow short duration sim_instr() exits to avoid recalibrating timers ...

- sim_instr() returns to scp (during script execution) that start simulation
  again in less than 1 tick of the calibrated clock now leverage the previous
  calibration state when instruction execution resumes.
- Only generate catchup ticks for clocks that are still running.
- Revert windows sim_os_msec() implementation back to use the multi-media
  timer which is required on Windows XP and shouldn't be affected by dynamic
  OS time adjustments that do affect System Time.

2018-09-28 18:04:34 -07:00

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