Merge pull request #991 from pytorch/anuragd/module_fallback_fix

(//core): Align with prim::Enter in module fallback

Author: narendasan

core/lowering/passes/module_fallback.cpp

@@ -43,12 +43,17 @@ void NotateModuleForFallback(
             "Notating module for fallback: " << n->s(c10::attr::name) << " (" << out_type << ") [owner: " << mod_name
                                              << " (" << cls_name << ")]");
         auto uses = n->output(0)->uses();
+        int k = 0;
         for (const auto u : uses) {
+          auto compilation_context_node = g->createNone();
+          auto compilation_context = compilation_context_node->outputs()[0];
+          compilation_context->setDebugName("compilation_context_" + std::to_string(k++));
           auto user = u.user;
-          auto delim_start_n = g->create(torch::jit::prim::Enter, 0);
+          auto delim_start_n = g->create(torch::jit::prim::Enter, {compilation_context});
           delim_start_n->s_(c10::Symbol::attr("compilation_edge"), "start");
-          auto delim_end_n = g->create(torch::jit::prim::Exit, 0);
+          auto delim_end_n = g->create(torch::jit::prim::Exit, {compilation_context});
           delim_end_n->s_(c10::Symbol::attr("compilation_edge"), "end");
+          compilation_context_node->insertBefore(user);
           delim_start_n->insertBefore(user);
           delim_end_n->insertAfter(user);
         }