[lworld] RFR: 8288131: [lworld] Implement javac flag -XDenablePrimitiveClasses [v4]

[David Simms]

On Thu, 22 Sep 2022 02:40:04 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> Primitive classes support should be opted in using a compiler option
>
> Vicente Romero has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - fixing varhandle tests
>  - fixing benchmark tests

Hotspot test changes look fine (assuming `make exploded-test TEST=hotspot_valhalla` passes)

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Marked as reviewed by dsimms (Committer).

PR: https://git.openjdk.org/valhalla/pull/758