[Bug tree-optimization/78902] Missed malloc optimizations: malloc w/o LHS and zero argument

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78902

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 40399
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40399&action=edit
Patch candidate

Would be such change acceptable in GCC 7, or should be wait for GCC 8?