[Bug rtl-optimization/68641] undefined variables implicitly considered to be zero

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68641

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> OTOH I'd just use it as an excuse to drop init-regs.c ...

It has a rather big comment explaining why it was needed though.