net/http/pprof: skip TestDeltaProfile on all arm and arm64 architectures

Given that we have seen failures with the same failure mode on both
openbsd/arm and android/arm64, it seems likely that the underlying bug
affects at least all ARM-based architectures.

It appears that either these architectures are not able to sample at
the frequency expected by the test, or the samples are for some reason
being dropped.

For #50218

Change-Id: I42a6c8ecda57448f8068e8facb42a4a2cecbbb37
Reviewed-on: https://go-review.googlesource.com/c/go/+/383997
Trust: Bryan Mills <[email protected]>
Run-TryBot: Bryan Mills <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>

Author: Bryan C. Mills

src/net/http/pprof/pprof_test.go

@@ -153,7 +153,7 @@ func mutexHog(duration time.Duration, hogger func(mu1, mu2 *sync.Mutex, start ti
 }
 
 func TestDeltaProfile(t *testing.T) {
-	if runtime.GOOS == "openbsd" && runtime.GOARCH == "arm" {
+	if strings.HasPrefix(runtime.GOARCH, "arm") {
 		testenv.SkipFlaky(t, 50218)
 	}