Track down non-determinism in Finch compiler

[willow-ahrens]

There appears to be some nondeterministic behavior somewhere in the compiler, and it causes tests to fail on julia 1.6 sometimes. It would be great if someone could track it down. Open to suggestions on how to do this.

[willow-ahrens]

I had to disable continuous tests due to nondeterminisim, but one should turn it on to see the issue