Make fill independent on code unit type #5691

Job	Run time
mingw (mingw64)	3m 51s
build (windows-2019, Win32, v142, 17, Debug)	1m 25s
mingw (ucrt64)	4m 40s
build (windows-2019, Win32, v142, 17, Release)	2m 49s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 12s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 42s
build (windows-2019, x64, v140, 14, Debug)	1m 30s
build (windows-2019, x64, v140, 14, Release)	2m 28s
build (windows-2019, x64, v141, 17, Debug)	1m 51s
build (windows-2019, x64, v141, 17, Release)	3m 1s
build (windows-2019, x64, v142, 17, Debug)	1m 14s
build (windows-2019, x64, v142, 17, Release)	2m 8s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 30s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 58s
build (windows-2019, x64, v142, 20, Debug)	1m 46s
build (windows-2019, x64, v142, 20, Release)	2m 32s
build (windows-2022, x64, v143, Debug, 20)	2m 22s
	38m 59s

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