bug#39893: 27.0.90; cannot turn on orgtbl

[Tak Kunihiro]

I cannot call turn-on-orgtbl without (require 'org).
It is autoload function.  I guess this is bug.

$ emacs --version
GNU Emacs 27.0.90 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 
Version 10.14.6 (Build 18G3020)) of 2020-03-04
$ emacs -Q
(turn-on-orgtbl) ;=> progn: Symbol’s function definition is void: turn-on-orgtbl
(require 'org-table) 
(turn-on-orgtbl) ;=> orgtbl-mode: Symbol’s function definition is void: 
org-load-modules-maybe
(require 'org)
(turn-on-orgtbl) ;=> t