Two issues:
- The demo page does not seem to be doing much, so the value is limited.
- The benchmark instruction count has too much variance to be useful.
The demo page doesn't do a lot, but might still be useful.
100 runs is enough to get rid of any prominent compilation overhead
in the profiles.
Closes GH-12466.
This allows https://nielsdos.github.io/php-benchmark-visualisation/ to only
show commits from master (or a specific branch). Otherwise we get confusing,
undulating commits from different branches, with potentially wildly different
performance.
Closes GH-12101
