patch 9.0.1625: "super" is not considered a reserved name

Problem:    "super" is not considered a reserved name.
Solution:   Add "super" to the list of reserved names. (closes #12515)

src/testdir/test_vim9_assign.vim

@@ -311,6 +311,8 @@ def Test_reserved_name()
 
   for name in ['true',
                'false',
+               'this',
+               'super',
                'null',
                'null_blob',
                'null_dict',
@@ -322,6 +324,15 @@ def Test_reserved_name()
     v9.CheckDefExecAndScriptFailure(['var ' .. name .. ' =  0'], 'E1034:')
     v9.CheckDefExecAndScriptFailure(['var ' .. name .. ': bool'], 'E1034:')
   endfor
+
+  var lines =<< trim END
+      vim9script
+      def Foo(super: bool)
+	echo 'something'
+      enddef
+      defcompile
+  END
+  v9.CheckScriptFailure(lines, 'E1034:')
 enddef
 
 def Test_null_values()
@@ -1526,6 +1537,7 @@ def Test_assignment_failure()
   v9.CheckDefFailure(['var false = 1'], 'E1034:')
   v9.CheckDefFailure(['var null = 1'], 'E1034:')
   v9.CheckDefFailure(['var this = 1'], 'E1034:')
+  v9.CheckDefFailure(['var super = 1'], 'E1034:')
 
   v9.CheckDefFailure(['[a; b; c] = g:list'], 'E1001:')
   v9.CheckDefFailure(['var [a; b; c] = g:list'], 'E1080:')

src/userfunc.c

@@ -86,12 +86,23 @@ one_function_arg(
 	return arg;
     }
 
-    // Vim9 script: cannot use script var name for argument. In function: also
+    // Extra checks in Vim9 script.
-    // check local vars and arguments.
+    if (!skip && argtypes != NULL)
-    if (!skip && argtypes != NULL && check_defined(arg, p - arg,
+    {
+	int c = *p;
+	*p = NUL;
+	int r = check_reserved_name(arg, FALSE);
+	*p = c;
+	if (r == FAIL)
+	    return arg;
+
+	// Cannot use script var name for argument. In function: also check
+	// local vars and arguments.
+	if (check_defined(arg, p - arg,
 				   evalarg == NULL ? NULL : evalarg->eval_cctx,
 			       eap == NULL ? NULL : eap->cstack, TRUE) == FAIL)
 	    return arg;
+    }
 
     if (newargs != NULL && ga_grow(newargs, 1) == FAIL)
 	return arg;

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1625,
 /**/
     1624,
 /**/

src/vim9script.c

@@ -1122,6 +1122,7 @@ static char *reserved[] = {
     "null_string",
     "null_channel",
     "null_job",
+    "super",
     "this",
     NULL
 };