[5.1] [String] [Foundation] perf: UTF8 String -> Data #24239
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Currently, `str.data(using:allowLossyConversion)` always bridges via `NSString`. As `String` is now natively UTF8 we can fastpath this conversion in the case where the user requests UTF8 encoding. A benchmark for this was previously added in swiftlang#22648.
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Cherry-pick of #24215 to
swift-5.1-branch.Currently,
str.data(using:allowLossyConversion)always bridges viaNSString.As
Stringis now natively UTF8 we can fastpath this conversion in thecase where the user requests UTF8 encoding.
A benchmark for this was previously added in #22648.