[Bug tree-optimization/126856] [17 Regression] mpfr and mpc started failing tests recently since r17-3204

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126856

--- Comment #5 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Macleod from comment #4)
> (In reply to Andrew Macleod from comment #3)
> > (In reply to Drea Pinski from comment #1)
> And invoke it from simple_dce_from_worklist.   I can poke at it tomorrow
> maybe.

Or pass a bitmape into simple_dce_from_worklist which then sets it for the ssa
name that is "deleted".