Make fill independent on code unit type #5690

Job	Run time
mingw (mingw64)	4m 17s
mingw (ucrt64)	4m 26s
build (windows-2019, Win32, v142, 17, Debug)	1m 48s
build (windows-2019, Win32, v142, 17, Release)	2m 35s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	2m 2s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 29s
build (windows-2019, x64, v140, 14, Debug)	1m 22s
build (windows-2019, x64, v140, 14, Release)	2m 24s
build (windows-2019, x64, v141, 17, Debug)	1m 30s
build (windows-2019, x64, v141, 17, Release)	2m 6s
build (windows-2019, x64, v142, 17, Debug)	1m 12s
build (windows-2019, x64, v142, 17, Release)	2m 51s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 41s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 28s
build (windows-2019, x64, v142, 20, Debug)	1m 46s
build (windows-2019, x64, v142, 20, Release)	3m 8s
build (windows-2022, x64, v143, Debug, 20)	2m 20s
	40m 25s

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