[Bug pch/70183] fdump-rtl-all-flags doesn't have impact on vzeroupper pass

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70183

--- Comment #1 from vries at gcc dot gnu.org ---
Created attachment 37932
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37932&action=edit
tentative patch