Request for making repository public

[javier-godoy]

This repository is a streamlined version of https://github.com/FlowingCode/AddonsDemo/ that reproduces oracle/graal#8725

I've carefully removed a substantial portion of the code that didn't contribute to the issue, and I think the remaining code has no confidential information and thus can be made public. Kindly review and confirm.

[mlopezFC]

No problems, go ahead