Do not dereference end iterators
Do not dereference end iterators

It causes exceptions in MSVC STL in Debug config when debug
iterators are enabled (default).

xtensor-stack/xsimd,JohanMabille/xsimd,xtensor-stack/xsimd,JohanMabille/xsimd,nxblas/nxsimd,jmabille/nxsimd