RFR: bug: no warning shown for parameterized conversions [v5]

[Vicente Romero]

On Thu, 10 Mar 2022 00:56:53 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> no warning is shown for parameterized conversions
>
> Vicente Romero has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - updating comment
>  - refactorings and cleanups to address review comments

I have updated the PR with the refactoring you proposed, thanks

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PR: https://git.openjdk.java.net/valhalla/pull/666