[m-rev.] for post-commit review: use actual types in groundness tests

[Zoltan Somogyi]

On 2024-07-02 22:20 +10:00 AEST, "Julien Fischer" <jfischer at opturion.com> wrote:
> I haven't had a chance to review this yet, but either this change or
> the following one appear
> to have broken compilation of the library in the
> asm_fast.gc.profdeep.tr.stseg grade in this
> evening's rotd build.

I will have a look.

Zoltan.