git: openjdk/jdk: 8246788: ZoneRules invariants can be broken

[Stuart Marks]

Changeset: a8871776
Author:    Stuart Marks <smarks at openjdk.org>
Date:      2021-01-22 18:51:32 +0000
URL:       https://git.openjdk.java.net/jdk/commit/a8871776

8246788: ZoneRules invariants can be broken

Reviewed-by: rriggs, naoto

! src/java.base/share/classes/java/time/zone/ZoneRules.java
+ test/jdk/java/time/test/java/time/zone/TestMutableZoneRules.java