runtime: use unsafe.{String,StringData} in arena test
Change-Id: Ia567b163efe7b323694c15abcf0cef0effc6ff6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/501995 Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>