[Bug tree-optimization/57742] memset(malloc(n),0,n) -> calloc(n,1)

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57742

--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 31003
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31003&action=edit
walk_aliased_vdefs experiment

Incomplete patch I used for my previous comment.