22652b305e
Allow precompiling specialization constants variations in parallel. Only supported in OpenGL as the rest of the batch compilation API, on the other backends the function is a no-op. This also moves the `SpecializationConstant` from `gpu_shader_create_info` (private API) into`GPU_common_types` (public API). Pull Request: https://projects.blender.org/blender/blender/pulls/122796