RFR: JDK-8301460: Clean up LambdaForm to reference BasicType enums directly [v2]

[Jorn Vernee]

On Tue, 14 Feb 2023 19:30:27 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> `LambdaForm` declares int constants for `BasicType::ordinal` to workaround JDK-8161245.   Now these int constants are no longer needed.    This removes these int constants and reference `BasicType` enums directly.
>
> Mandy Chung 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 three additional commits since the last revision:
> 
>  - Merge branch 'master' of https://github.com/openjdk/jdk into JDK-8301460
>  - further clean up
>  - JDK-8301460: Code in LambdaForm.java still refers to resolved JDK-8161245

Marked as reviewed by jvernee (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/12546