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4324716dc5384f03dcd7e36e8cca0e944e4dac74 by Evan Brown <ezb@google.com>:

Clarify comments about API differences from std::{set,map} in btree headers.

We note that the most important API differences are mentioned in the next paragraph and that other API differences are minor. An example of another minor API difference is the note about std::launder in the comment for `extract`.

Motivation: readers shouldn't feel like they need to read the entire header file to understand why b-tree containers are not "drop-in replacements" for STL containers.
PiperOrigin-RevId: 408703780

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7e8da4f14afd25d11713eee6b743ba31605332bf by Derek Mauro <dmauro@google.com>:

Remove the test for absl::base_internal::NominalCPUFrequency() from OSS code

This is an internal-only function that should never by called by OSS code.
By its nature fails on unsupported platforms.
Google code has tests for this function on supported internal platforms.

Fixes #1053

PiperOrigin-RevId: 408692861

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37bad2e003b17e3f82d6fd5d90ae183553c018b0 by Abseil Team <absl-team@google.com>:

To avoid triggering -Wmissing-variable-declarations warnings, ABSL_FLAG now
declares the Flag before defining it.

PiperOrigin-RevId: 408673990
GitOrigin-RevId: 4324716dc5384f03dcd7e36e8cca0e944e4dac74
Change-Id: I8c8ea73c4a4e38729c5bfdfa3fefb5d593e0536c