Refactor jvmtiEvent so we can add to it.

Change all code over to using ArtJvmtiEvent from jvmtiEvent so that we
have a way to add additional internal events if the need arises.

Bug: 32369913
Bug: 31684920

Test: mma -j40 test-art-host

Change-Id: I555475048d2e753db8adf317dc1f66d81533cde0
5 files changed