https://bugzilla.kernel.org/show_bug.cgi?id=204725
--- Comment #34 from Dmitri Seletski (drjoms@gmail.com) --- and while I uninstalled llvm to manually download and install llvm, i realised i had more than one version of it!
i perhaps needed to simply switch to version 10 from 7. With that said, i again remind, issue with black screen hits before Xorg and after amdgpu is loaded.
i am recompiling version 10. lets see if message changes.