Two tests in the test/hotspot/jtreg/vmTestbase need to be updated in advance of deny illegal access by default:

nsk/jdi/ObjectReference/invokeMethod/invokemethod006/TestDescription.java
nsk/jdi/ClassType/invokeMethod/invokemethod009/TestDescription.java

Both tests use setAccessible to get at the non-public constructor for ObjectReferenceImpl in the non-exported package com.sun.tools.jdi.