sse2 mm_pause: more archs, add a basic test

[mr-c]

@junaruga Do you know why the rpm-builds did not start?

[junaruga]

@mr-c I found Packit's status page. It seems the Copr used to build is outage right now.

https://status.packit.dev/

Copr frontend instability → Copr is experiencing issues with its frontend which is currently mitigated while Copr team investigates.

In case some of your builds were not submitted, please retrigger.

In other words, I can see that there are other applications running Copr. https://dashboard.packit.dev/pipelines

So, I think the workaround is to try this PR such as by adding empty commit, the rebase the PR by squashing.

$ git commit --allow-empty
$ git rebase -i <a commit>

[mr-c]

Thanks for checking @junaruga ; git commit --amend --reset-author seems to have worked

[junaruga]

Good to know it!