GitLab

* Fix HIP-Clang GPU build issues

Add missing device attributes for GPU functions. GPU functions must be annotated with __device__ in HIP.

* Use HIP device function max and min

* Fix clang-format-5.0 issues

* Undo change that breaks on HIP-HCC
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>