User-submitted performance reports

In light of not really having a place for people to submit dav1d performance reports, here's an issue that people can reply to with their reports.

Please use the following template:

• hardware:
• software:
• dav1d revision:
• dav1d command line:
• input file:
• framerate:
• (optional) perf report:

You can get a perf report by installing the perf package and running dav1d like perf record ./dav1d .... Don't use framerate info from the same run though, as perf may slow things down a bit. You can then use perf report to get the relevant report information.