RFR: 8285364: Remove REF_ enum for java.lang.ref.Reference [v10]

[Albert Mingkun Yang]

On Tue, 28 Jun 2022 19:43:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple rename and some comments update.
>> 
>> Test: build
>
> Albert Mingkun Yang has updated the pull request incrementally with four additional commits since the last revision:
> 
>  - arg rename
>  - default arg
>  - revert
>  - fix-build

Thank you for the help and review.

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PR: https://git.openjdk.org/jdk/pull/8332