hg: jdk/sandbox: 8224600: Provide VM.events command

[chris.hegarty at oracle.com]

Changeset: bb3359bcf534
Author:    stuefe
Date:      2019-06-05 07:25 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/bb3359bcf534

8224600: Provide VM.events command
Reviewed-by: minqi, dholmes, mbaesken, clanger

! src/hotspot/share/compiler/compileBroker.cpp
! src/hotspot/share/gc/shared/collectedHeap.hpp
! src/hotspot/share/services/diagnosticCommand.cpp
! src/hotspot/share/services/diagnosticCommand.hpp
! src/hotspot/share/utilities/events.cpp
! src/hotspot/share/utilities/events.hpp
+ test/hotspot/jtreg/serviceability/dcmd/vm/EventsTest.java