[jdk8u] RFR: 8303828: [Solaris] Broken jdk8u build after JDK-8266391

[Andrew John Hughes]

On Thu, 9 Mar 2023 16:59:22 GMT, Adam Farley <afarley at openjdk.org> wrote:

>> Because Solaris currently lacks this class, the build breaks when compiling Metrics.java. Inserting a dummy class to fix that.
>> 
>> This takes the same approach as [JDK-8303408](https://bugs.openjdk.org/browse/JDK-8303408), only on Solaris.
>> 
>> This change is being proposed directly to JDK8u because I'm not aware of Solaris platform support post-JDK8.
>> 
>> P.S. This PR is being created for jdk8u (as well as jdk8u-dev) as per this advice [here](https://github.com/openjdk/jdk8u-dev/pull/280#issuecomment-1460740821).
>
> Thanks Severin. :)

@adamfarley, doesn't matter for this one (as the testers don't build on Solaris anyway obviously), but you should make sure to enable GitHub Actions in your fork for any future changes, so testing will run.

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PR: https://git.openjdk.org/jdk8u/pull/37