Heuristic for eager parsing works for async functions

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index e1e3d3412281a274f2a3d03079735cc7c113a2de..af038a7fd71b38fac37fa876f63fdd26eeb2f85a 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -1847,7 +1847,8 @@ typename ParserBase<Impl>::ExpressionT ParserBase<Impl>::ParsePrimaryExpression(
       }
       // Heuristically try to detect immediately called functions before
       // seeing the call parentheses.
-      if (peek() == Token::FUNCTION) {
+      if (peek() == Token::FUNCTION ||
+          (peek() == Token::ASYNC && PeekAhead() == Token::FUNCTION)) {
         function_state_->set_next_function_is_likely_called();
       }
       ExpressionT expr = ParseExpressionCoverGrammar(true, CHECK_OK);