Unit Tests Failures

[matthewseaman]

A number of unit tests are failing after the LLVM 11 upgrade.

1. Open Package in Xcode
2. Test the LLVM scheme

Big Sur

[matthewseaman]

Some of this seems to be updates to the LLVM IR method signatures.

[matthewseaman]

I have a branch ready to go to fix these. Depends on #224.