hg: jdk/sandbox: 8231546: Suppress warnings on non-serializable instance fields in java.prefs module

[chris.hegarty at oracle.com]

Changeset: cf7c6f013d6d
Author:    darcy
Date:      2019-09-26 12:13 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/cf7c6f013d6d

8231546: Suppress warnings on non-serializable instance fields in java.prefs module
Reviewed-by: rriggs

! src/java.prefs/share/classes/java/util/prefs/NodeChangeEvent.java