RFR: 8251397: Add release fence to ClassValueMap constructor

[David Holmes]

On Thu, 10 Sep 2020 13:29:29 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Just noting here that @galderz is a Red Hat employee and should be covered by the Red Hat OCA:
>> https://www.oracle.com/technical-resources/oracle-contributor-agreement.html#r
>
> @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.

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