runtime: handle m0 padding better The SpinbitMutex experiment requires m structs other than m0 to be allocated in 2048-byte size class, by adding padding. Do the calculation more explicitly, to avoid future CLs like CL 653335. Change-Id: I83ae1e86ef3711ab65441f4e487f94b9e1429029 Reviewed-on: https://go-review.googlesource.com/c/go/+/654595 Reviewed-by: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Michael Knyszek <mknyszek@google.com>
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