Since SPIRV-Tools now implements a linker, we could use it, to provide a linker for the VC4C compiler.

Provide an interface (can be separate from compiler-interface) to link together two intermediate binaries (LLVM-IR or SPIR-V).

LLVM/CLang support linking via llvm-link, SPIR-V via tools/spirv-link in SPIRV-Tools.

Problem:
Both utils only support "full linking", where implementations for all functions need to be available, which is not the case since the vc4cl_ intrinsic functions are not implemented in any intermediate format.