Use constexpr in place of __constant__ when using the kokkos backend.
#123
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Variables with the
__constant__qualifier cannot be read in Kokkos host functions, causing the compiler to throw a warning. This branch replaces the__constant__qualifier withconstexpron non-CUDA platforms to resolve this warning. The changes were tested on Perlmutter and Frontier using the Delta Wing test, showing a less than 1% increase in completion time.