WIP [esnext] implement async iteration proposal

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index 8360627f6199dc4d9a9fc6a24e1bc05d443f1fe2..4137f1f9e5f4bf913c745ff1eebf3e5c97663f7f 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -288,6 +288,13 @@ void AstNumberingVisitor::VisitCallRuntime(CallRuntime* node) {
       catch_prediction_ == HandlerTable::ASYNC_AWAIT) {
     node->set_context_index(Context::ASYNC_FUNCTION_AWAIT_UNCAUGHT_INDEX);
   }
+
+  // Similar measures are taken for AsyncGeneratorAwait calls.
+  if (node->is_jsruntime() &&
+      node->context_index() == Context::ASYNC_GENERATOR_AWAIT_CAUGHT &&
+      catch_prediction_ == HandlerTable::ASYNC_AWAIT) {
+    node->set_context_index(Context::ASYNC_GENERATOR_AWAIT_UNCAUGHT);
+  }
 }