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a9ea60e9c0ccd744b6f12fd021dbedfe826dfe84 by Matt Kulukundis <kfm@google.com>:

Add an internal hook to allow keeping flags in sync with global state.

Rollforward, except continue including hashtablez_flags.h in absl_flags.h so users don't break.

PiperOrigin-RevId: 412198044

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183e5c440b68c797ce4a82102f94f41c97a14674 by Martijn Vels <mvels@google.com>:

Internal cleanups and changes

PiperOrigin-RevId: 412083793

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3740faf7c5a2e1723e3c7e4d1b3f3db7cbec6e61 by Abseil Team <absl-team@google.com>:

Mark Cord::Clear() with the ABSL_ATTRIBUTE_REINITIALIZES attribute.

This prevents false positives in the clang-tidy check bugprone-use-after-move; it allows Clear() to be called on a moved-from Cord without any warnings, and the Cord will thereafter be regarded as initialized again.

PiperOrigin-RevId: 412082757

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a730d3f4ba06b55ae50386920a0544592069ac01 by Abseil Team <absl-team@google.com>:

StrJoin: Support iterators that do not have an `operator->`

Allows using `StrJoin` with iterators that do not have an `operator->`.
The `operator->` requirement for input iterators was dropped in C++20.

PiperOrigin-RevId: 412066130

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6773c0ced2caa6a7855898298faecc584f3997ec by Andy Soffer <asoffer@google.com>:

Rollback of internal hook for keeping flags in sync with global state.

PiperOrigin-RevId: 411895027

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4e7016a2fb88ce97853ef85ad5b4f76998eacca1 by Matt Kulukundis <kfm@google.com>:

Add an internal hook to allow keeping flags in sync with global state.

PiperOrigin-RevId: 411867376

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2a7d4056e467b6b5d8a7aa9398d6cb5454c10fc5 by Martijn Vels <mvels@google.com>:

Internal change

PiperOrigin-RevId: 411806932
GitOrigin-RevId: a9ea60e9c0ccd744b6f12fd021dbedfe826dfe84
Change-Id: Ib35bb7b40774979ed2ad205bbb1744b1085eae78