[lworld] RFR: 8373912: [lworld] Small cleanups to InlineKlass [v2]

[Stefan Karlsson]

On Wed, 17 Dec 2025 17:21:21 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> A few cleanups found while scanning over the InlineKlass files:
>> 
>> * Fix include list and forward declarations
>> * Move non-trivial implementation out of .hpp
>> * Remove copy-n-past functions from InstanceKlass
>> * Remove redundant CDS function overrides
>> * Deduplicate null marker address calculation
>> * Deduplicate allocate_instance
>> * Fix raw casts from oop 
>> * Tweak comments
>
> Stefan Karlsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove lingering references to InlineKlassFixedBlock

Thanks for the review, Coleen! Tier1 passes.

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PR Comment: https://git.openjdk.org/valhalla/pull/1818#issuecomment-3669698318