RFR: 8340831: Simplify simple validation for class definition in MethodHandles.Lookup [v2]

[Claes Redestad]

On Wed, 25 Sep 2024 14:47:10 GMT, Chen Liang <liach at openjdk.org> wrote:

>> `MethodHandles.Lookup` defines a `ClassFile` for simple validations; it is unnecessary and can be scalarized manually. The removal of `ClassFile` class is also slightly helpful for bootstrap by reducing class loading. Also improved class file version checking in `VM` class.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename to internalName where possible

Marked as reviewed by redestad (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21170#pullrequestreview-2328513487