hg: valhalla/valhalla: 8211026: jdb should not allow to assign null to value type

[frederic.parain at oracle.com]

Changeset: 551414bf7586
Author:    fparain
Date:      2019-10-16 10:57 -0400
URL:       https://hg.openjdk.java.net/valhalla/valhalla/rev/551414bf7586

8211026: jdb should not allow to assign null to value type
Reviewed-by: mchung

! src/jdk.jdi/share/classes/com/sun/tools/jdi/ValueImpl.java