Add spline r2 rt #28

Job	Run time
spack-centos-stream (GCC11-NoMPI-Debug-Real)	6m 1s
spack-centos-stream (GCC11-NoMPI-NoOMP-Real)	11m 2s
spack-centos-stream (GCC11-NoMPI-NoOMP-Complex)	36m 15s
spack-centos-stream (GCC11-NoMPI-Sandbox-Real)	6m 1s
linux (GCC9-NoMPI-Debug-Real)	4m 42s
linux (GCC9-NoMPI-NoOMP-Real)	9m 3s
linux (GCC9-NoMPI-NoOMP-Complex)	36m 36s
linux (GCC9-NoMPI-Sandbox-Real)	5m 8s
linux (GCC9-MPI-Gcov-Real)	12m 54s
linux (GCC9-MPI-Gcov-Complex)	56m 29s
linux (GCC11-NoMPI-Werror-Real)	9m 8s
linux (GCC11-NoMPI-Werror-Complex)	35m 22s
linux (GCC11-NoMPI-Werror-Real-Mixed)	10m 44s
linux (GCC11-NoMPI-Werror-Complex-Mixed)	26m 7s
linux (Clang14-NoMPI-ASan-Real)	9m 13s
linux (Clang14-NoMPI-ASan-Complex)	34m 0s
linux (Clang14-NoMPI-UBSan-Real)	10m 19s
linux (Clang16-NoMPI-Offload-Real)	9m 41s
macos (macOS-GCC11-NoMPI-Real)	20m 45s
	5h 49m 30s

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