Branchfree bitmask calculation #893

Job	Run time
windows_msvc2022	2m 48s
linux_gcc (ubuntu-latest, Debug)	4m 32s
windows_mingw64 (windows-latest, Debug)	8m 55s
linux_gcc (ubuntu-latest, Release)	1m 18s
windows_mingw64 (windows-latest, Release)	3m 33s
windows_msvc2022_POPCNT	2m 5s
linux_128bit	10m 34s
linux_clang (ubuntu-latest, Debug)	5m 59s
linux_clang_mpopcnt (ubuntu-latest, Debug)	6m 19s
linux_clang (ubuntu-latest, Release)	2m 50s
linux_clang_mpopcnt (ubuntu-latest, Release)	2m 36s
linux_gcc_mpopcnt (ubuntu-latest, Debug)	4m 31s
linux_gcc_mpopcnt (ubuntu-latest, Release)	1m 15s
linux_gcc_sanitizers	3m 5s
linux_gcc_valgrind	1m 5s
macos_clang (macos-latest, Debug)	2m 46s
macos_clang (macos-latest, Release)	58s
	1h 5m 9s

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