Redundant dereferences in C2 shenandoah_wb?

[Roland Westrelin]

>> I'm working on turning it into IR and that would change how
>> implicit null checks are handled.
>
> Okay, this means the changes in .ad are not relevant at this point, and
> code quality should be investigated after barriers are spelled in IR.

I have other changes that are mostly ready that will affect code
generation. So it probably makes sense to wait a bit.

Roland.