Debug wait_timeout

Author: pguyot

src/libAtomVM/opcodesswitch.h

@@ -2539,6 +2539,9 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
                     PROCESS_SIGNAL_MESSAGES();
 #pragma GCC diagnostic pop
                     int needs_to_wait = 0;
+                    if (context_get_flags(ctx, WaitingTimeoutExpired)) {
+                        printf("OP_WAIT -- WaitingTimeoutExpired is already set\n");
+                    }
                     if (context_get_flags(ctx, WaitingTimeout | WaitingTimeoutExpired) == 0) {
                         if (timeout != INFINITY_ATOM) {
                             scheduler_set_timeout(ctx, t);