RFR 8243592: Subject$SecureSet::contains(null) is suboptimal

[Sean Mullan]

The fix looks fine to me. For consistency, you could make the same 
change for null elements in the other SecureSet methods: add, remove.

--Sean

On 4/25/20 3:39 AM, Weijun Wang wrote:
> Please take a review at
> 
>     http://cr.openjdk.java.net/~weijun/8243592/webrev.00/
> 
> This is helpful if we do any set arithmetic between 2 Subject objects.
> 
> No new regression test, I intend to add a noreg-trivial label.
> 
> *Tigran*: Please confirm you are OK with the "Contributed-by" line.
> 
> Thanks,
> Max
>