Block records are not processed; only the bitcode is validated.
-- v2: vkd3d-shader/dxil: Read global abbreviated operands. vkd3d-shader/dxil: Read local abbreviated operands. vkd3d-compiler: Introduce a dxbc-dxil source type. vkd3d-shader/dxil: Read and validate DXIL bitcode unabbreviated blocks.