runtime/debug: increase threshold on TestSetGCPercent

Currently TestSetGCPercent checks that NextGC is within 10 MB of the
expected value. For some reason it's much noisier on some of the
builders. To get these passing again, raise the threshold to 20 MB.

Change-Id: I14e64025660d782d81ff0421c1eb898f416e11fe
Reviewed-on: https://go-review.googlesource.com/41374
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>

src/runtime/debug/garbage_test.go

@@ -135,7 +135,7 @@ func TestSetGCPercent(t *testing.T) {
 		t.Fatalf("failed to set up baseline live heap; got %d MB, want %d MB", ms.Alloc>>20, baseline>>20)
 	}
 	// NextGC should be ~200 MB.
-	const thresh = 10 << 20
+	const thresh = 20 << 20 // TODO: Figure out why this is so noisy on some builders
 	if want := int64(2 * baseline); abs64(want-int64(ms.NextGC)) > thresh {
 		t.Errorf("NextGC = %d MB, want %d±%d MB", ms.NextGC>>20, want>>20, thresh>>20)
 	}