RFR: 8288129: Shenandoah: Skynet test crashed with iu + aggressive

[Ashutosh Mehra]

On Mon, 29 Aug 2022 16:09:05 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The neat thing with using the right Access API stores instead of an ad hoc barrier, is that it works for both shenandoah IU mode, and generational ZGC, while the ad hoc barrier does not.

@fisk are you suggesting that changing the Access API from `set_parent_raw` to `set_parent_access` is the right approach? This introduces gc policy specific code which does not look clean.
It appears that the combination of `requires_barriers()` and `do_barriers()` API is suppose to encapsulate the gc policy specific requirements. `requires_barriers()` would handle any gc specific requirement for using barriers and `do_barriers()` would then take the necessary action. This makes sense as it keeps the code clean. wdyt?

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PR: https://git.openjdk.org/jdk/pull/9982