shader: Implement SR_THREAD_KILL

src/shader_recompiler/shader_info.h

@@ -92,6 +92,7 @@ struct Info {
 
     bool uses_workgroup_id{};
     bool uses_local_invocation_id{};
+    bool uses_is_helper_invocation{};
     bool uses_subgroup_invocation_id{};
 
     std::array<InputVarying, 32> input_generics{};