RFR: 7903390: Summary reporter getter not thread-safe

[Daniel D. Daugherty]

On Fri, 2 Dec 2022 17:21:37 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Prevent `ConcurrentModificationException` by making the two static methods that populate the instance map `synchronized`.
>
> Ideally we should have a test, but this might be a hard one to test

@jonathan-gibbons - So how do we get the fixed jtreg into use in the jdk/jdk CI?

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PR: https://git.openjdk.org/jtreg/pull/139