avx2/character-string-to-utf8: simplify calculations
avx2/character-string-to-utf8: don't use a lookup table for sizes
ffi.texinfo: struct by value is supported on Windows
arm64/character-string-to-utf8: reduce GPR calculations
avx2/character-string-to-utf8: reduce a LUT by 4KB
arm64/character-string-to-utf8: reduce a LUT by 4KB
arm64/character-string-to-utf8: don't use a lookup table for sizes
Stop reusing potentially optimized inlined functions