Backport performance fix for C++17 #1618
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2 tests disabled: - boundary_conditions_gpu because of GridTools#1522 - test_tuple.cu conversion constructor for Clang 11.0.0 because of GridTools#1615
With C++17, `as_const` was added into the standard and if `as_const` is not called qualified, we end up with `std::as_const` (which is also a better match) in most cases because there is some `std` inside one of the template arguments. By qualifying `as_const`, performance is fixed. For GTBench, performance is identical with `-std=c++14` and `-std=c++17` now.
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