RFR: JDK-8286153: Remove redundant casts and other cleanup [v2]

Thu May 5 18:14:15 UTC 2022

On Thu, 5 May 2022 17:20:25 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review some cleanup updates to address issues reported by an IDE.
>> 
>> The seeds for the change were a series of redundant casts, that have now all been removed.  Various other warnings and suggestions were made by the IDE for the affected files. There were a number of places with redundant type arguments, for which the general fix was in favor of using `var` instead of `<>`.
>> 
>> Some `switch` statements were converted to the enhanced `switch` form, which also revealed a couple of places where `RECORD` should have been added alongside `ENUM`.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address review feedback

Marked as reviewed by prappo (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8543