RFR: JDK-8289106: Add model of class file versions to core reflection [v2]

[Mandy Chung]

On Wed, 29 Jun 2022 21:32:29 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> JDK-8289106: Add model of class file versions to core reflection
>
> Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 10 additional commits since the last revision:
> 
>  - Add method to map from major class file version.
>  - Merge branch 'master' into JDK-8289106
>  - Update phrasing.
>  - Augment and correct docs.
>  - Correct major versions; RELEASE_0 and RELEASE_1 are both 45.
>  - Make major method public.
>  - Add AccessFlag.locations(ClassFileFormatVersion)
>  - Add ClassFileFormatVersion <-> Runtime.Version conversions.
>  - Merge branch 'master' into JDK-8289106
>  - JDK-8289106: Add model of class file versions to core reflection

This `ClassFileFormatVersion` API is a good proposal.   It can also reference `java.class.version` system property to map to the latest class file format version.

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PR: https://git.openjdk.org/jdk/pull/9299