hg: jdk/sandbox: 8220355: Improve assertion texts and exception messages in eventHandlerVMInit

[chris.hegarty at oracle.com]

Changeset: f554d3e88da3
Author:    mbaesken
Date:      2019-03-18 15:29 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/f554d3e88da3

8220355: Improve assertion texts and exception messages in eventHandlerVMInit
Reviewed-by: alanb, sspitsyn, jcbeyler

! src/java.instrument/share/native/libinstrument/InvocationAdapter.c
! src/java.instrument/share/native/libinstrument/JPLISAgent.c