Add fast AVX2-based implementation of mb_check_encoding for UTF-8#10436

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alexdowad wants to merge 2 commits intophp:masterfrom

Commits on Jan 24, 2023

Adjust code to finish validating remaining 0-8 bytes at end of UTF-8 string
alexdowad
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Commits on Jan 25, 2023

Add AVX2-accelerated version of mb_check_encoding for UTF-8 only
alexdowad
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