RFR: 8271880: Tighten condition for excluding regions from collecting cards with cross-references [v11]

[Thomas Schatzl]

On Mon, 20 Sep 2021 12:30:58 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> Sorry for not getting to this one until now, but took a first quick look at this.
> 
> Apart from the small comment below, I think we might want to split this into two separate PRs. One to add the new reference processing abstraction with the general use and then do the specific G1 changes as another PR. What do you think about that?

I will first revert the faulty JDK-8270842, then add the API, then add the G1 specific code if you prefer.

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PR: https://git.openjdk.java.net/jdk/pull/5037