[Bug middle-end/116926] [15 Regression] Recent changes in dot-product causing ICE on c6x port

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116926

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Victor Do Nascimento from comment #3)
> Potential fix:
> 
> https://gcc.gnu.org/pipermail/gcc-patches/2024-October/665021.html

Oh I see now, the original potential fix was exactly the same as my suggestion
in comment #6 and the request for a change by Richard had missed that
FOR_EACH_MODE's limit meant from_mode was not being checked. Will update my
commit log with this information too.

Anyways the fix in comment #7 is the simplified fix.