[Bug tree-optimization/92750] DSE fails to remove all dead clobbers

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92750

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=34949

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So PR 34949 is what kept around the clobbers here.
but that was before clobber_kind was added.

So if we have:
   MEM[(struct Vec *)&a] ={v} {CLOBBER(bob)};
   MEM[(struct Vec *)&a].val = _48;
   MEM[(struct Vec *)&a + 1B] ={v} {CLOBBER(bob)};
   MEM[(struct Vec *)&a + 1B].val = _48;
   MEM[(struct Vec *)&a + 2B] ={v} {CLOBBER(bob)};
   MEM[(struct Vec *)&a + 2B].val = _48;

since that is the begining of the object and the object is fully initialized,
removing the clobber for bob should be ok.