Prevent liveedit on or under generators with open activations

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 80c96012002f986b9c74e9f7930106c42fc3a3ee..11d2acad907f4d1b9c0c088d421d673e6da3d6db 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7522,6 +7522,8 @@ class JSGeneratorObject: public JSObject {
   // cannot be resumed.
   inline int continuation();
   inline void set_continuation(int continuation);
+  inline bool is_closed();
+  inline bool is_executing();
   inline bool is_suspended();
 
   // [operand_stack]: Saved operand stack.