patch 9.0.1250: cannot use an object method with :defer

Problem:    Cannot use an object method with :defer. (Ernie Rael)
Solution:   Find the object method and generate code to call it.
            (closes #11886)
diff --git a/src/vim9cmds.c b/src/vim9cmds.c
index 763d8b3..69c04ae 100644
--- a/src/vim9cmds.c
+++ b/src/vim9cmds.c
@@ -1910,6 +1910,7 @@
     int		defer_var_idx;
     type_T	*type;
     int		func_idx;
+    int		obj_method = 0;
 
     // Get a funcref for the function name.
     // TODO: better way to find the "(".
@@ -1925,8 +1926,15 @@
 	// TODO: better type
 	generate_PUSHFUNC(cctx, (char_u *)internal_func_name(func_idx),
 							   &t_func_any, FALSE);
-    else if (compile_expr0(&arg, cctx) == FAIL)
-	return NULL;
+    else
+    {
+	int typecount = cctx->ctx_type_stack.ga_len;
+	if (compile_expr0(&arg, cctx) == FAIL)
+	    return NULL;
+	if (cctx->ctx_type_stack.ga_len >= typecount + 2)
+	    // must have seen "obj.Func", pushed an object and a function
+	    obj_method = 1;
+    }
     *paren = '(';
 
     // check for function type
@@ -1958,7 +1966,7 @@
     defer_var_idx = get_defer_var_idx(cctx);
     if (defer_var_idx == 0)
 	return NULL;
-    if (generate_DEFER(cctx, defer_var_idx - 1, argcount) == FAIL)
+    if (generate_DEFER(cctx, defer_var_idx - 1, obj_method, argcount) == FAIL)
 	return NULL;
 
     return skipwhite(arg);