[master] RFR: 8308900: [Lilliput] Cherry-pick C2 prototype header improvements

[Roman Kennke]

On Fri, 26 May 2023 07:17:51 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> GHA shows the infrastructural problems on x86_32, and seemingly unrelated test failure on x86_64.

I have not seen those before, but yes, they look unrelated.

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PR Comment: https://git.openjdk.org/lilliput/pull/95#issuecomment-1563947419