vim-patch:9.0.0397: :defer not tested with exceptions and ":qa!"

Problem:    :defer not tested with exceptions and ":qa!".
Solution:   Test :defer works when exceptions are thrown and when ":qa!" is
            used.  Invoke the deferred calls on exit.

58779858fb

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/main.c

@@ -30,6 +30,7 @@
 #include "nvim/eval.h"
 #include "nvim/eval/typval.h"
 #include "nvim/eval/typval_defs.h"
+#include "nvim/eval/userfunc.h"
 #include "nvim/event/multiqueue.h"
 #include "nvim/event/stream.h"
 #include "nvim/ex_cmds.h"
@@ -693,6 +694,9 @@ void getout(int exitval)
   // Position the cursor on the last screen line, below all the text
   ui_cursor_goto(Rows - 1, 0);
 
+  // Invoked all deferred functions in the function stack.
+  invoke_all_defer();
+
   // Optionally print hashtable efficiency.
   hash_debug_results();