Replace if-Conditions by Ternary Operators in Nabla (#1798) #99

Job	Run time
perftests (gcc-8, release)	1m 30s
perftests (gcc-9, release)	1m 30s
perftests (gcc-10, release)	1m 37s
perftests (gcc-11, release)	1m 44s
perftests (gcc-12, debug)	2m 9s
perftests (gcc-12, release)	1m 39s
perftests (gcc-13, debug)	2m 8s
perftests (gcc-13, release)	1m 40s
perftests (clang-11, debug)	1m 50s
perftests (clang-11, release)	1m 55s
perftests (clang-12, debug)	1m 57s
perftests (clang-12, release)	1m 55s
perftests (clang-13, release)	2m 0s
perftests (clang-14, release)	2m 12s
perftests (clang-15, debug)	1m 51s
perftests (clang-15, release)	1m 55s
perftests (clang-16, debug)	1m 56s
perftests (clang-16, release)	1m 57s
perftests (clang-14-cuda-11, debug)	5m 55s
perftests (clang-14-cuda-11, release)	5m 16s
perftests (gcc-10-cuda-11.8, debug)	5m 41s
perftests (gcc-10-cuda-11.8, release)	5m 26s
perftests (gcc-11-cuda-12.0, debug)	5m 46s
perftests (gcc-11-cuda-12.0, release)	4m 57s
perftests (gcc-12-cuda-12.3, debug)	5m 54s
perftests (gcc-12-cuda-12.3, release)	5m 20s
perftests (gcc-12-cuda-12.4, debug)	5m 43s
perftests (gcc-12-cuda-12.4, release)	5m 17s
perftests (base-hip, debug)	7m 24s
perftests (base-hip, release)	6m 4s
perftests (gcc-10-hpx, release)	3m 41s
perftests (nvhpc-23.3, debug)	11m 42s
perftests (nvhpc-23.3, release)	9m 56s
perftests (nvhpc-23.9, debug)	11m 6s
perftests (nvhpc-23.9, release)	13m 14s
	2h 31m 47s

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