internal/testenv: update linux-arm to linux-arm-scaleway

CL 303230 renamed the linux-arm builder to linux-arm-scaleway, but the
x/tools ExitIfSmallMachine guard was not updated accordingly, resulting
in consistent failures for some tests.

For golang/go#45931
For golang/go#46183
Updates golang/go#32834

Change-Id: Ief5f17fc61cb38cf6b7cf63b6cd5e64f9d56261e
Reviewed-on: https://go-review.googlesource.com/c/tools/+/322409
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

internal/testenv/testenv.go

@@ -182,8 +182,9 @@ func NeedsTool(t Testing, tool string) {
 // It should be called from within a TestMain function.
 func ExitIfSmallMachine() {
 	switch os.Getenv("GO_BUILDER_NAME") {
-	case "linux-arm":
-		fmt.Fprintln(os.Stderr, "skipping test: linux-arm builder lacks sufficient memory (https://golang.org/issue/32834)")
+	case "linux-arm-scaleway":
+		// "linux-arm" was renamed to "linux-arm-scaleway" in CL 303230.
+		fmt.Fprintln(os.Stderr, "skipping test: linux-arm-scaleway builder lacks sufficient memory (https://golang.org/issue/32834)")
 		os.Exit(0)
 	case "plan9-arm":
 		fmt.Fprintln(os.Stderr, "skipping test: plan9-arm builder lacks sufficient memory (https://golang.org/issue/38772)")