runtime: skip TestSegv/SegvInCgo earlier on ios

It appears to sometimes hang instead of crashing,
which can cause subsequent tests to time out.

For #59947.

Change-Id: Id4ac3c0cd5f7f345334d3e0ed3f48e40b9ff191c
Reviewed-on: https://go-review.googlesource.com/c/go/+/492075
TryBot-Result: Gopher Robot <[email protected]>
Auto-Submit: Bryan Mills <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Bryan Mills <[email protected]>

Author: Bryan C. Mills

src/runtime/crash_cgo_test.go

@@ -643,6 +643,10 @@ func TestSegv(t *testing.T) {
 		}
 
 		t.Run(test, func(t *testing.T) {
+			if test == "SegvInCgo" && runtime.GOOS == "ios" {
+				testenv.SkipFlaky(t, 59947) // Don't even try, in case it times out.
+			}
+
 			t.Parallel()
 			got := runTestProg(t, "testprogcgo", test)
 			t.Log(got)