RFR: 8314842: zgc/genzgc tests ignore vm flags

[Leonid Mesnik]

On Thu, 12 Sep 2024 09:31:46 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Change some ZGC tests to propagate requested vm flags.
> 
> I tested this by manually passing in various flags to jtreg. I also ran tier1-5 on Linux.

Marked as reviewed by lmesnik (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20963#pullrequestreview-2301742629