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7b6a68aa92dcc7247236d1a1813914e035383bf8 by Abseil Team <absl-team@google.com>:

Use atomic exchange to mark completion in absl::once_flag

This prevents a potential for a missed wakeup if one thread marks
itself as a waiter while another thread is completing the invocation.

PiperOrigin-RevId: 344946791

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ddff21d1dde08d1368d8be5fca81b154e78be2fc by Abseil Team <absl-team@google.com>:

Add missing string_view include. This is currently used transitively through the cord header.

PiperOrigin-RevId: 344845266
GitOrigin-RevId: 7b6a68aa92dcc7247236d1a1813914e035383bf8
Change-Id: Ia24e98a1df832fc4cb491d888fdf21182b5954f4