fixup! erts: Fair handover of code permissions to first waiter

Author: sverker

erts/emulator/beam/code_ix.c

@@ -322,6 +322,8 @@ static void release_code_permission(struct code_permission *perm,
                 /*
                  * Avoid processes doing potentially long GC.
                  * Resume them and let them retry after GC is done.
+                 * This can only happen if someone has sent the waiting
+                 * suspended process a GC signal.
                  */
                 xstate = erts_atomic32_read_nob(&(qitem->p->xstate));
                 while (!(xstate & ERTS_PXSFLG_GC)) {