[Bug rtl-optimization/40209] stale REG_UNUSED note vs single_set

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40209

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |16.0
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed finally by r16-6062-ge1b8d097297d63.