[MPS test] `void-function igc--collect` on scratch/igc branch (commit: `42731228d2`)

[Eval Exec <execvy@gmail.com>]

Hello,

I want to help test `scratch/igc` branch on my Linux environment, then
I clone `scratch/igc` branch from
https://git.savannah.gnu.org/git/emacs.git.
the scratch/igc branch's commit ID is `42731228d24c37edb2dc848c3a74d5c932a817ef`

Then I build emacs by:
```bash
make extraclean
./autogen.sh \
  && ./configure \
  --prefix=$(realpath ../emacs-build)\
  --with-mps \
  --with-imagemagick \
  --with-modules --with-x-toolkit=lucid --without-compress-install \
  --without-toolkit-scroll-bars --with-native-compilation  --with-mailutils\
  --with-tree-sitter --with-xinput2  \
  --with-dbus  --with-native-compilation=aot \
  --with-file-notification=inotify\
  && make -j20 install
```

After build success, I notice there is an interactive command:
`igc-collect`, so I `M-x igc-collect`, then I got:

```elisp
Debugger entered--Lisp error: (void-function igc--collect)
  igc--collect()
  igc-collect()
  funcall-interactively(igc-collect)
  command-execute(igc-collect record)
  #<subr execute-extended-command>(nil "igc-collect" nil)
  ad-Advice-execute-extended-command(#<subr execute-extended-command>
nil "igc-collect" nil)
  apply(ad-Advice-execute-extended-command #<subr
execute-extended-command> (nil "igc-collect" nil))
  execute-extended-command(nil "igc-collect" nil)
  funcall-interactively(execute-extended-command nil "igc-collect" nil)
  command-execute(execute-extended-command)
```


Is this expected? Did I miss something when I building Emacs?
Thank you.