GitLab

Remove std references in runtime compilation since these are not available when using hiprtc and the headers may not be available on the system

Move to CI containers to rocm 5.0.2
upgrade to 20.04
free up some more file space in github action environments

This adds the infrastructure so we can compile everything in parallel, whereas before only pointwise kernels were compiled in parallel. This will also directly integrate with lowering and the gpu-driver. The kernels for pointwise and roialign are using this infrastructure. Scatternd is not since it does require standard shape.

This also makes it easier to add new runtime compiled kernels in the future.