runtime: use QPC for nanotime and time.now on windows/arm
The previous implementation of nanotime and time.now 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-on: https://go-review.googlesource.com/c/154758Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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