Remove iree dependencies from requirements.txt (#190)
Remove iree dependencies from requirements.txt (#190)

- Comment the IREE dependencies since they seem unavailable at the moment.
- This revision closes #189
iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox,iree-org/iree-llvm-sandbox