WIP: vc4 shaderdb improvements
As I am working on NIR topics (for etnaviv) I want to test some concepts etc with other drivers and often use drm-shim with shaderdb. This is my current state to get the final asm of the nir shader.
I am not really sure how to fill struct vc4_vs_key correctly - any help is welcome.
This is an outcome of !9412 (closed).