[Bug tree-optimization/58483] missing optimization opportunity for const std::vector compared to std::array

[dl.soluz at gmx dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58483

--- Comment #4 from dennis luehring <dl.soluz at gmx dot net> ---
rechecked with latest clang 3.3(3.4) on http://gcc.godbolt.org/

reduces both cases std::array and std::vector down to

return 160