[lilliput-jdk17u:lilliput] RFR: 8310231: [Lilliput/JDK17] Disable compact headers by default

[Roman Kennke]

On Fri, 16 Jun 2023 16:25:52 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Same as https://github.com/openjdk/lilliput/pull/99.
> 
> Note that I also reverted the change to `UseCompressedClassPointers`, for extra safety.
> 
> Additional testing:
>  - [x] Checked sample `@flagless` tests run with/without `UCOH`
>  - [ ] Linux x86_64 tier1, out of box
>  - [ ] Linux x86_64 tier1, `-XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders`
>  - [ ] Linux x86_64 tier1, `-XX:+UnlockExperimentalVMOptions -XX:-UseCompactObjectHeaders`

Looks good to me! Thanks!

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Marked as reviewed by rkennke (Reviewer).

PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/33#pullrequestreview-1484083699