Add 2 more constexprs to fix compile error #6606

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 40s
build (windows-2019, Win32, v142, 17, Release)	1m 57s
mingw (mingw64)	3m 35s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 0s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 16s
build (windows-2019, x64, v140, 14, Debug)	1m 33s
mingw (ucrt64)	4m 43s
build (windows-2019, x64, v140, 14, Release)	2m 8s
build (windows-2019, x64, v141, 17, Debug)	1m 11s
build (windows-2019, x64, v141, 17, Release)	2m 5s
build (windows-2019, x64, v142, 17, Debug)	1m 6s
build (windows-2019, x64, v142, 17, Release)	2m 45s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 13s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 6s
build (windows-2019, x64, v142, 20, Debug)	1m 39s
build (windows-2019, x64, v142, 20, Release)	3m 17s
build (windows-2022, x64, v143, Debug, 20)	1m 55s
	36m 9s

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