Fix for [SR-3448] Crash in String.replacingOccurrences(of:with:) with… #796
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… emoji on Linux
Foundation.NSMutableString.replaceCharacters assumed that the passed-in NSRange was character-based but it's UTF-16 based.
The fix was to use the UTF-16 view and then convert the indexes back to characters.
All credit to @allevato for coming up with the fix.
This also resolves [SR-3449].