[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 #2 from vries at gcc dot gnu.org ---
(In reply to vries from comment #1)
> Created attachment 37932 [details]
> tentative patch

Which has the desired effect:
...
$ rm *.c.* ; gcc test.c -S -fdump-rtl-all-slim -mavx -mvzeroupper
-fexpensive-optimizations
$ grep -c '(insn' *.c.* | grep -v ':0'
$ 
...