hg: jdk/jdk: 8239055: Wrong implementation of VMState.hasListener

[poonam.bajaj at oracle.com]

Changeset: 06b31c23a9a8
Author:    fmatte
Date:      2020-02-27 19:33 -0800
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/06b31c23a9a8

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