[Bug middle-end/106688] out of ssa Coalescing sometimes chooses the wrong thing causing an extra move

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106688

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> _33 = (const unsigned char *) ivtmp.18_7;
>   invariant up to level 2, cost 1.

Yep, that's an "old" thing, PRE would have moved it but LIM has something they
call a cost model.