runtime: use platform.RaceDetectorSupported for -race tests
Don't try to duplicate the list of targets that support -race.
Change-Id: I889d5c2f4884de89d88f8efdc89608aa73584a8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/487575
Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>