RFR: 8264322: Generate CDS archive when creating custom JDK image [v2]

[Calvin Cheung]

On Fri, 20 Aug 2021 02:04:52 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> I'd prefer to leave it as is for now since it's in a test case and I don't think the code is complex.
>
> This is fragile by setting `os.name`.

I've filed [JDK-8272868](https://bugs.openjdk.java.net/browse/JDK-8272868) to follow-up the above issue.

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PR: https://git.openjdk.java.net/jdk/pull/5174