runtime, syscall, time: add and use resettimer As a small step toward speeding up timers, restrict modification of the timer.when field to the timer code itself. Other code that wants to change the when field of an existing timer must now call resettimer rather than changing the when field and calling addtimer. The new resettimer function also works for a new timer. This is just a refactoring in preparation for later code. Updates #27707 Change-Id: Iccd5dcad415ffbeac4c2a3cf015e91f82692acf8 Reviewed-on: https://go-review.googlesource.com/c/go/+/171825 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
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