RFR: 8364187: Make getClassAccessFlagsRaw non-native [v5]

[Tobias Hartmann]

On Wed, 30 Jul 2025 19:25:34 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This change removes the intrinsic for getClassAccessFlagsRaw for reflection and initializes an rawAccessFlags field in java.lang.Class instead, that Java code can non-natively access.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Restore c2 optimization.

Compiler changes look good to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26517#pullrequestreview-3075269461