[stdlib] Do a fast NFC check over the slice instead of guts #71481
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glessard
approved these changes
Feb 8, 2024
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When hashing strings/substrings, we do a fast nfc check over the slice to determine if we can skip normalization. Unfortunately this was asking the entire guts for its UTF8 buffer, instead of asking for its own UTF8 buffer. This caused us to iterate the entire base string instead of just searching the slice.
Resolves: rdar://122490088