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506fa3e10b3d8399ad937c32ecea26d1ad4e62bb by Abseil Team <absl-team@google.com>:

Disable ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE when GCC < 8.2.0 is used with libc++

PiperOrigin-RevId: 399707056

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656b7c7cee87f46a4bc7953618796f82da08e62c by Derek Mauro <dmauro@google.com>:

Remove the MSVC flag implementation from flag.h to help clarify that
methods on absl::Flag<T> are not part of the public API

PiperOrigin-RevId: 399584678

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a92a9bc156303bc663b84c4b704891ec8f67e333 by Abseil Team <absl-team@google.com>:

Get rid of MemcpyIfAllowed while continuing to suppress erroneous warnings

PiperOrigin-RevId: 399468864

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5f9a66895f707ba001fb51b88c0c6025f8c872a3 by Abseil Team <absl-team@google.com>:

Use feature testing to check for availability of invoke_result.

Feature testing should be available by C++20, which removes invoke_result.
https://en.cppreference.com/w/cpp/feature_test

PiperOrigin-RevId: 399447373

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946c0a502b4499dbfcabf1ab93ddde0048288fb4 by CJ Johnson <johnsoncj@google.com>:

Add rvalue-reference qualifier to the Commit method on ConstructionTransaction

PiperOrigin-RevId: 399442206

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726a4d036eff49aeb6fd0ca2b1775699b6844395 by Greg Falcon <gfalcon@google.com>:

Internal change

PiperOrigin-RevId: 399441870

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1df6d3f659b88dbac13c3d8e13db23bb3844ece2 by Abseil Team <absl-team@google.com>:

Clang-format whitespace changes

PiperOrigin-RevId: 399281271

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4a828cde95a07421d699ebac775b37810624214f by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 399234071

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e520c72b34ba2f98668c889139001f8276243d31 by Greg Falcon <gfalcon@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 399233662
GitOrigin-RevId: 506fa3e10b3d8399ad937c32ecea26d1ad4e62bb
Change-Id: I92b9176d2387c08eb167f9268efa78b55b8e09c2