runtime/pprof: ignore cpu profile test failures on openbsd/arm

This test is currently too flakey on openbsd/arm - ignore failures for the time
being.

Change-Id: Ia334d188f505167e691177ebe2c7a2df54bf556a
Reviewed-on: https://go-review.googlesource.com/c/153579Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>

src/runtime/pprof/pprof_test.go

@@ -193,6 +193,10 @@ func testCPUProfile(t *testing.T, matches matchFunc, need []string, avoid []stri
 	switch runtime.GOOS {
 	case "darwin", "dragonfly", "netbsd", "solaris":
 		t.Skipf("ignoring failure on %s; see golang.org/issue/13841", runtime.GOOS)
+	case "openbsd":
+		if runtime.GOARCH == "arm" {
+			t.Skipf("ignoring failure on %s/%s; see golang.org/issue/13841", runtime.GOOS, runtime.GOARCH)
+		}
 	}
 	// Ignore the failure if the tests are running in a QEMU-based emulator,
 	// QEMU is not perfect at emulating everything.