Horrible intermittent errors

[lastmjs]

• Lots of scary intermittent errors in the tests
• make sure post_upgrade stdlib initialization is completely every time
• make sure we aren't swallowing any errors during vm initialization
• perhaps our unsafe code is breaking down, asynchronous stuff not working, race conditions, heap being overwritten, etc
• My first most hopefuly suspicion is that there is some kind of stable memory error. I am turning off stable filesystem storage in ic-wasi-polyfill to see if that fixes it
• Study ic-wasi-polyfill for heap or stable memory corruptions