[esnext] prototype runtime implementation for async functions

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 8eb6ff577308015c0ec7ee0e7984d04d4e43ac81..add65dd462666a40e91d3eef57b145b42887b933 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -429,8 +429,8 @@ void EnsureFeedbackVector(CompilationInfo* info) {
 
 bool UseIgnition(CompilationInfo* info) {
   if (info->is_debug()) return false;
-  if (info->shared_info()->is_generator() && !FLAG_ignition_generators) {
-    return false;
+  if (info->shared_info()->is_resumable()) {
+    return FLAG_ignition_generators;
   }
 
   // Checks whether top level functions should be passed by the filter.