fix local TP memory leak

It free `rb_hook_list_t` itself if needed. To recognize the
need, this patch introduced `rb_hook_list_t::is_local` flag.

This patch is succession of https://github.com/ruby/ruby/pull/4652

1 files changed, 2 insertions, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index 78d06012a1..6bbce23078 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -609,8 +609,9 @@ void rb_objspace_call_finalizer(struct rb_objspace *);
 typedef struct rb_hook_list_struct {
     struct rb_event_hook_struct *hooks;
     rb_event_flag_t events;
-    unsigned int need_clean;
     unsigned int running;
+    bool need_clean;
+    bool is_local;
 } rb_hook_list_t;