hg: jdk-updates/jdk13u-dev: 8239055: Wrong implementation of VMState.hasListener

[yan at azul.com]

Changeset: a6b35b8ceb05
Author:    fmatte
Date:      2020-02-27 19:33 -0800
URL:       https://hg.openjdk.java.net/jdk-updates/jdk13u-dev/rev/a6b35b8ceb05

8239055: Wrong implementation of VMState.hasListener
Summary: Correct the VMState.hasListener implementation to return WeakReference<VMListener> type
Reviewed-by: sspitsyn, poonam

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