runtime: don't assume b.N > 0
Change-Id: I2e26717f2563d7633ffd15f4adf63c3d0ee3403f Reviewed-on: https://go-review.googlesource.com/20856 Run-TryBot: Marcel van Lohuizen <mpvl@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>
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