Move NVSHMEM kernels into separate file to limit application of -rdc=true. #28
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This PR splits compilation of CUDA kernels in cuDecomp into two files (
cudecomp_kernels.cuandcudecomp_kernels_rdc.cu) to limit the application of-rdc=trueto only kernels that require that flag (e.g. kernels that use NVSHMEM device functions). It was observed that the combination of-rdc=trueand__launch_bounds__on our batched memcopy kernels caused an unexpectedly high increase in registers. Compiling those kernels without-rdc=trueresolves this issue and improves memcopy kernel occupancy/performance.