[master] RFR: 8311875: [Lilliput] Disallow accessing oop metadata vmStructs with +UCOH

[Roman Kennke]

On Tue, 11 Jul 2023 14:45:06 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Same as for JDK 17, but for mainline. I had to deal with some upstream reshufflings that moved the agent initialization block.
> 
> Additional testing:
>  - [x] Eyeballing async-profiler initialization path in default mode and with `+UCOH`
>  - [x] Linux x86_65 fastdebug `serviceability/sa tier1 tier2`, default
>  - [x] Linux x86_65 fastdebug `serviceability/sa tier1 tier2`, `+UCOH`

Looks good, thank you!

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Marked as reviewed by rkennke (Lead).

PR Review: https://git.openjdk.org/lilliput/pull/101#pullrequestreview-1536863459