Since parallel compilations was introduced, a validation error
was signalling that push constants for compute shaders didn't have
the correct pipeline binding. The root cause was that the pipeline
binding was determined, before the type of shader was known.
This PR fixes this by detemining if a shader is a compute shader up
front. It also removes some code that could lead to issues.
Pull Request: https://projects.blender.org/blender/blender/pulls/128010
56b7ff256f