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[BoundsSafety][-Wunsafe-buffer-usage] Interop cherry-picks #9766

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[BoundsSafety][-Wunsafe-buffer-usage] Interop cherry-picks #9766

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Same cherry picks as #9746 but towards stable/20240723

@ziqingluo-90 ziqingluo-90 requested a review from a team as a code owner December 19, 2024 00:37
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[BoundsSafety][-Wunsafe-buffer-usage] Add a safe pattern of span cons…
40107d6 
…truction from bounds-attributed pointers (swiftlang#9746)

For a `__sized_by(n)` pointer `p`, constructing a std::span the way below is safe.
`std::span<char>{(char *)p, n}`

cherry-picked from downstream
(rdar://141103910)

(cherry picked from commit ec0e03c)
@ziqingluo-90 ziqingluo-90 force-pushed the ziqing/stable20240723/interop-cherrypicks branch from 0031494 to 40107d6 Compare December 19, 2024 23:36
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