Karl Seguin d68f39b541 std.unicode.utf8ValidateSlice: optimize implementation (#17329) ...

Originally inspired by Go's `utf8.Valid` function. Includes some test cases from Go's test suite.

Further optimized to be faster in all tested cases (short/long ascii/UTF8), in all release modes.

Takes advantage of SIMD for the ASCII fast path.

2023-10-06 23:49:21 -04:00

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