RFR: 8251397: Add release fence to ClassValueMap constructor

[Galder Zamarreño]

On Mon, 14 Sep 2020 02:56:43 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> @galderz We'll have to wait until somebody marks your github handle as OCA approved or some such :-/
>
> Please ensure the PR title and the bug synopsis match before this in integrated!
> 
> Please DO NOT force-push updates as you lose the history of commits and anyone following this cannot see what changes
> were actually made at each step! You do not need to worry about intermediate commits as they will only appear in your
> branch and in the PR. The actual committed changeset will be a single flattened version of your changes.

Are you expecting anything else from me? @jerboaa already proposed as sponsor above.

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PR: https://git.openjdk.java.net/jdk/pull/94