A few options here:

• Hack the compiler to just output the data layout that we want
• Add #[repr(std140)] and #[repr(std430)] to the language frontend (maybe have better names for when we want to support non-Vulkan backends with different layout requirements
• Support #[repr(Rust)] and #[repr(C)] natively through Vulkan's Scalar Block Layout. (Note that this comes with a performance warning).
• All / most of the above