Part of //go:build change (#41184).
See https://golang.org/design/draft-gobuild
The Go 1.17 gofmt will insert the extra //go:build lines.
The older gofmts will not remove them.
Get ahead of the game by adding them now.
(Keeps x/tools tests passing on go repo trybots.)
Change-Id: Ifdb4af93f6cc38a9aa616516e923384b7312e991
Reviewed-on: https://go-review.googlesource.com/c/tools/+/294413
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Trust: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>