Investige using Release/Acquire updates

[rovarga]

We are currently using volatile updates, which may be stronger access than we really need. With Java 9 we have more granular memory model available. Investigate if and where we can take advantage of it.

[rovarga]

The problem here is probably RDCSS method needs to ensure previous update of nested updates need to have been published. This needs a close evaluation of the whitepaper.