bpo-35766: Merge typed_ast back into CPython (GH-11645)

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 9b6371d..c7a622c 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -158,6 +158,8 @@
         parser_flags |= PyPARSE_IGNORE_COOKIE;
     if (flags->cf_flags & CO_FUTURE_BARRY_AS_BDFL)
         parser_flags |= PyPARSE_BARRY_AS_BDFL;
+    if (flags->cf_flags & PyCF_TYPE_COMMENTS)
+        parser_flags |= PyPARSE_TYPE_COMMENTS;
     return parser_flags;
 }