hg: jdk/submit: 8243592: Subject$SecureSet::addAll should not call contains(null)

[weijun.wang at oracle.com]

Changeset: b97c78f3f588
Author:    weijun
Date:      2020-07-09 09:22 +0800
URL:       https://hg.openjdk.java.net/jdk/submit/rev/b97c78f3f588

8243592: Subject$SecureSet::addAll should not call contains(null)
Reviewed-by: mullan

! src/java.base/share/classes/javax/security/auth/Subject.java
+ test/jdk/javax/security/auth/Subject/UnreliableContains.java