[lilliput-jdk17u:lilliput] RFR: 8319524: [Lilliput] Only warn when compact headers are explicitly enabled

[Aleksey Shipilev]

On Thu, 23 Nov 2023 14:26:13 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> This backports [JDK-8319524: [Lilliput] Only warn when compact headers are explicitly enabled
> ](https://bugs.openjdk.org/browse/JDK-8319524) to lilliput-jdk17u. The backport is not clean, because there is no ZGenerational flag to check.
> 
>  - [x] tier1 +UCOH +ZGC

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/lilliput-jdk17u/pull/64#pullrequestreview-1746757662