e.g. https://storage.googleapis.com/go-build-log/9b937dd8/linux-arm_df54a25a.log

Change-Id: Ic5864c7bd840b4f0c6341f919fcbcd5c708b14e7
Reviewed-on: https://go-review.googlesource.com/22881Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>