inc/core/benchmark_data.hpp: Fixed MSVC 2015 issue that constexpr functions can only have one return statement
inc/core/benchmark_data.hpp: Fixed MSVC 2015 issue that constexpr functions can only have one return statement

mpicbg-scicomp/gearshifft,mpicbg-scicomp/gearshifft,tdd11235813/gearshifft,tdd11235813/gearshifft