autocd doesn't invoke customized `cd` wrapper

[transl8czech]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -D_FORTIFY_SOURCE=2 -g 
-O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat 
-Werror=format-security -Wall
uname output: Linux laptop 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 11
Release Status: release

Description:
  If `cd` is a function or an alias in my environment, I think autocd ought to 
invoke
  that instead of the raw `command cd` (like it does now).

  Personally, I keep a stack of recent directories and I record frequences of 
the directories I'm
  in in my `cd` wrapper, and it'd be nice if autocd didn't circumvent the 
wrapper.

Repeat-By:

  Steps to reproduce:
    $ cd(){ echo cding; command cd "$@"; }
    $ shopt -s autocd
    $ /etc
      cd /etc
    # cd /var
      cding

Fix:
        [Description of how to fix the problem.  If you don't know a
        fix for the problem, don't include this section.]