Add static_assert

src/targets/gpu/kernels/include/migraphx/kernels/ck_gemm.hpp

@@ -51,6 +51,9 @@ __device__ void ck_gemm_matrix(E e, A a, B b, Ds... ds)
                                              to_ck_tensor<ck_transposeb<B>>(),
                                              ck::make_tuple(to_ck_tensor<Ds>()...),
                                              to_ck_tensor<E>());
+
+    static_assert(desc.is_valid, "Invalid ck gemm.");
+
     G::Run(desc,
            to_ck_const_pointer(a.data()),
            to_ck_const_pointer(b.data()),