The use of is_sorted in Benchmarker.h was ambiguous

Kenneth Moreland requested to merge kmorel/vtk-m:is-sorted-ambiguous into master

Benchmarker provides its own implementation of is_sorted since this method was not introduced until C++11 and not all compilers necessarily support it. However, for those that did, the system is_sorted conflicted with the provided is_sorted. To get around the problem, specify the full namespace of the is_sorted being used (which is standard practice in VTK-m anyway).

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