RFR: 8231672: Simplify the reference processing parallelization framework [v4]

[Kim Barrett]

On Tue, 23 Mar 2021 13:59:06 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> I agree. I further prefer not having an assert and instead using a reference. I also fear doing unrelated changes will be rejected. This is no new code of mine, it is added so that nullptr is used consistently after push-back from Thomas.
>
> What would you prefer?
> 1) keep as is now.
> 2) move to constructor.
> 3) use a reference instead.

I would probably move it to the constructor, but I don't feel strongly about it.

-------------

PR: https://git.openjdk.java.net/jdk/pull/2782