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 4fb26d5f7fc3270b96bdd0dcb3618212fa5c0c9e..de0fdd3eaa231f73778520bc2fddea05753ffb22 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -295,6 +295,13 @@ 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);
+  }
 }