Add project to fuzz PyPy3

[StanFromIreland]

I had to do some funky things in the build script to get instrumentation working, but it seems to build now.

Currently, the targets live in https://github.com/StanFromIreland/pypy-fuzz.git, but this may change in the future.

CC @cfbolz and @mattip

[github-actions]

StanFromIreland is integrating a new project:
- Main repo: https://github.com/pypy/pypy
- Criticality score: 0.58880

[mattip]

Nice. Sorry about the incomplete Makefile, fixes welcome. It might need a make install command?

It seems the fuzzing is passing? Or is it not running yet?

[StanFromIreland]

It seems the fuzzing is passing? Or is it not running yet?

The fuzzer builds, it just isn't running yet (as the PR hasn't been merged).

[StanFromIreland]

@DavidKorczynski, builds with ASAN currently fail. I tried some things, but I couldn't fix it. Is it possible to just have UBSan for now, and in the future when we figure out what's going on with ASAN add it in another PR? Furthermore, becasue of the GC, ASAN isn't a priority.

[StanFromIreland]

@DavidKorczynski Friendly ping :-)

[DavidKorczynski]

Overall this looks good -- but the run_tests.sh is just an empty file? No need to include it in case.

[StanFromIreland]

Thanks for the review, I've removed it.