[Bug tree-optimization/36602] memset should be optimized into an empty CONSTRUCTOR

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36602
Bug 36602 depends on bug 16427, which changed state.

Bug 16427 Summary: dead memset not optimized away
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16427

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED