nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1);
offset_const->value.u[0] = instr->variables[0]->var->data.offset;
nir_load_const_instr *offset_const = nir_load_const_instr_create(mem_ctx, 1);
offset_const->value.u[0] = instr->variables[0]->var->data.offset;