[compiler-v2][move-2] Non-deterministic unit test failures

[alnoki]

@brmataptos @fEst1ck @georgemitenkov @rahxephon89 @runtian-zhou @vineethk @wrwg

Steps to reproduce

This test fails non-deterministically when running this command from inside the enclosing package's src/move/rewards directory:

git ls-files | entr -c sh -c " \
    aptos move test --dev --move-2 --coverage &&
    aptos move fmt
"

The command watches the test directory and re-runs tests whenever I save in my IDE (VS Code), and when I just let it run then hit save, without modifying any source code the test fails about 10% of the time or so. I suspect that perhaps it has something to do with the ed25519 APIs? Maybe a stack overflow?

Note that the test shows a failure on a bogus line, and I often have to comment out some code, commit, then uncomment and retry and it will pass.