patch 9.1.0797: testing of options can be further improved

Problem:  testing of options can be further improved
Solution: split the generated option test into test_options_all.vim,
          add more test cases, save and restore values, fix use-after-free

closes: #15894

Signed-off-by: Milly <milly.ca@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/main.c

@@ -1694,7 +1694,11 @@ getout(int exitval)
     }
 
 #ifdef FEAT_VIMINFO
-    if (*p_viminfo != NUL)
+    if (
+# ifdef EXITFREE
+	    entered_free_all_mem == FALSE &&
+# endif
+	    *p_viminfo != NUL)
 	// Write out the registers, history, marks etc, to the viminfo file
 	write_viminfo(NULL, FALSE);
 #endif