[Bug rtl-optimization/93565] Combine duplicates count trailing zero instructions

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93565

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Why would that be unlikely?  It lengthens the lifetime of that pseudo,
potentially significantly.