RFR: 8302873: ZGC: dump barrier data in C2 Mach nodes

[Roberto Castañeda Lozano]

On Wed, 22 Feb 2023 10:01:29 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> No, this is just a generic fallback implementation in case other GCs want to adopt ZGC's very late barrier expansion model. Would you prefer to remove the `st->print` statement? Either way is fine by me.
>
> I was wondering if we should add `Unimplemented()` instead but I don't have a strong opinion either and leave that to you.

Thanks, I had not considered that option. If none of us have a strong opinion I will go with the current version, since it provides a minimal but still sensible default without forcing other GCs to develop a custom implementation should they adopt ZGC's barrier expansion model.

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PR: https://git.openjdk.org/jdk/pull/12662