RFR: Restrict generational mode to adaptive heuristic [v2]

[Aleksey Shipilev]

On Mon, 27 Mar 2023 18:01:55 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I added the generational mode to these tests because we've added a "post-write" barrier for card marking and it touches many of the same files. Figured it's better to error on the side of caution.
>
> Yes, but this test chases the particular compiler bug. Running in multiple modes with `-Xcomp` and `-XX:CompileOnly` might not be fast, so it is better to keep these regression tests targeted. It is not the issue for compiler tests that are not regression tests, like `TestCloneBarrier`.

I still don't think it is a good idea to touch these regression tests.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/233#discussion_r1151543507