set_output_size shouldn't reset existing outputs (#1694)

* set_output_size fix

* add assert

* dont run get_loop_kernels twice

src/ngraph/node.cpp

@@ -71,7 +71,7 @@ void Node::delayed_validate_and_infer_types()
 
 void Node::set_output_size(size_t n)
 {
-    m_outputs.clear();
+    NGRAPH_ASSERT(n >= m_outputs.size()) << "shrinking " << m_outputs.size() << " to " << n;
     for (size_t i = m_outputs.size(); i < n; ++i)
     {
         auto tensor_descriptor = make_shared<descriptor::Tensor>(

src/ngraph/runtime/cpu/pass/cpu_loop_kernel_fusion.cpp

@@ -94,7 +94,6 @@ public:
         for (auto e : m_graphs)
         {
             auto& lkg = e.second;
-
             NodeVector member_outputs = ngraph::get_subgraph_outputs(lkg.m_nodes, NodeVector{});
             auto lk = std::make_shared<runtime::cpu::op::LoopKernel>(
                 lkg.m_nodes, member_outputs, lkg.m_inputs);
@@ -213,5 +212,5 @@ bool ngraph::runtime::cpu::pass::CPULoopKernelFusion::run_on_function(
         }
     }
 
-    return !lkc.get_loop_kernels().empty();
+    return !loop_kernels.empty();
 }