Eclipse OpenJ9 v0.61.0

Eclipse release plan: https://projects.eclipse.org/projects/technology.openj9/releases/0.61.0

Release details:

Branch name: v0.61.0-release
Tag: openj9-0.61.0

Repo SHAs:

OpenJ9: eclipse-openj9/openj9@a1daf22
OMR: ebd02d9

For details about the release and release candidates, please see: https://github.com/eclipse/openj9/blob/master/doc/processes/release_process.md

For the list of OpenJ9 changes see https://github.com/eclipse/openj9/releases/tag/openj9-0.61.0

OMR Changes from 0.60.0

2e3166f..ebd02d9
ebd02d9 (0.61.0) Handle removed edges in mergeDefConstraints in GVP jimmyk #283