[Bug tree-optimization/114800] DSE does not remove set-zero which is partial redundant with respect to mod-ref

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114800

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note mod-ref does tells us that only f1, f3 are used here but DSE must have
missed that for `= {}`.

Note without the knowledge of foo, we still have a partial redundant zeroing
happening due to padding being zeroed so that might not be considered redundant
...