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

[Chen Liang]

On Tue, 24 Sep 2024 22:07:25 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.

Apparently forgot to push when I re-requested a review after the renames.

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PR Comment: https://git.openjdk.org/jdk/pull/21170#issuecomment-2374304742