Add aarch64 Linux machine to the pool

[mdboom]

This issue is tracking adding the new aarch64 Linux machine to our pool of benchmarking workers.

[mdboom]

Pyperf does some system tuning on Linux that assumes it's on Intel. We should disable that (and possibly replace it with ARM equivalents if it proves necessary):

https://github.com/psf/pyperf/pull/185

The above PR just disables the MSR settings which allows the other settings to complete successfully. There is probably a larger set of work to add any tunings specifically for ARM64 and maybe anything special about the specific machine as well.

[mdboom]

Some of the benchmarks are failing to install their dependencies (probably because wheels aren't available and some C library dependencies aren't installed).

• [x] aiohttp, gunicorn
  • yarl 1.9.2 doesn't build from source -- yarl 1.9.4 seems to work https://github.com/pyston/python-macrobenchmarks/pull/26
• [x] djangocms
  • Pillow missing required dependencies -- probably just some extra packages need to be installed on machine
• [ ] flaskblogging
  • "Benchmark died"

EDIT: Removed the failures that are also happening on Intel as well right now.