fix(mgb/opr): add layout constraint on the input of Cumsum

GitOrigin-RevId: d2d108e2786806aa3f4c44ebfc0bf5f094cdab42

src/opr/impl/misc.cpp

@@ -132,6 +132,10 @@ void Cumsum::scn_do_execute() {
                        intl::get_megdnn_workspace_from_var(output().back()));
 }
 
+void Cumsum::add_input_layout_constraint() {
+    input(0)->add_layout_constraint_contiguous();
+}
+
 void Cumsum::init_output_static_infer_desc() {
     using namespace cg::static_infer;
     auto infer_shape = [](TensorShape& dest, const InpVal& iv) {

src/opr/include/megbrain/opr/misc.h

@@ -86,6 +86,7 @@ public:
 //! cumulative sum along given axis
 MGB_DEFINE_OPR_CLASS(Cumsum, cg::SingleCNOperatorNodeBaseT<
         mixin::MegDNNOprHolderImpl<megdnn::Cumsum>>) // {
+    void add_input_layout_constraint() override;
 
     public:
         Cumsum(VarNode *src, const Param &param, const OperatorNodeConfig &config);