Fix GH-11997: ctype_alnum 5 times slower in PHP 8.1 or greater #12300
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Currently, a common function is used where a function pointer gets passed to check the character class type. If we instead use a macro, the macro version of these character class type checkers can be used. While this gives only a minor speed-up for glibc-based systems, on Alpine this gives a multi-facor speed-up
This is essentially a manual revert of dc80ea7.
Full discussion in GH-11997.