Michal Nazarewicz 28162ad970 char: µoptimise UTF-16 surrogates decoding
According to Godbolt¹, on x86_64 using binary and produces slightly
better code than using subtraction.  Readability of both is pretty
much equivalent so might just as well use the shorter option.

¹ https://rust.godbolt.org/z/9jM3ejbMx
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