runtime: use QPC for nanotime and on windows/arm

The previous implementation of nanotime and used a time source
that was updated on the system clock tick, which has a maximum
resolution of about 1ms. On 386 and amd64, this time source maps to
the system performance counter, so has much higher resolution.
On ARM, use QueryPerformanceCounter() to get a high resolution timestamp.

Updates #26148

Change-Id: I1abc99baf927a95b472ac05020a7788626c71d08
Reviewed-by: Brad Fitzpatrick <>
Run-TryBot: Brad Fitzpatrick <>
TryBot-Result: Gobot Gobot <>
2 files changed
tree: 9b67e4b0bd73d150289a8e5decaae8b56fc78e1f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  13. favicon.ico
  17. robots.txt

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