This fixes some crashes with dEQP-VK.descriptor_indexing.* when read_first_invocation has its source from a descriptor. Most of these tests still fail because of an LLVM bug (they work with ACO). Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>