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cfb567ed02096320663d882d2c0c2fb7db7af1e4 by Derek Mauro <dmauro@google.com>:

Upgrade to GCC 10.2.0, Bazel 3.5.0, and CMake 3.18.2

PiperOrigin-RevId: 330847323

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5dcb9ce14d92315163079366a91c43cbd5184ea4 by Evan Brown <ezb@google.com>:

Optimize equal_range() by avoiding the call to upper_bound() when possible.

We need to support heterogeneous comparators that have different behavior when comparing key_type to non-key_type. See the new test.

Also update the comment for `key_compare_to_adapter`.

PiperOrigin-RevId: 330794444

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744405dbda5513527d74094a5c3b9db1e0927693 by Gennadiy Rozental <rogeeff@google.com>:

Introduce trampoline for friend access to avoid friending routines and classes from different namespace.

PiperOrigin-RevId: 330773156

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a195d1226576f8a7bb5671f3e42d1021b827fad9 by Abseil Team <absl-team@google.com>:

Fix an incorrect version number test for std::variant availability in tvOs.

PiperOrigin-RevId: 330759480

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58b02eb9159a577953676d9928cb26b30068b847 by Derek Mauro <dmauro@google.com>:

Use c++20 instead of c++2a now that it is supported by GCC

PiperOrigin-RevId: 330559797
GitOrigin-RevId: cfb567ed02096320663d882d2c0c2fb7db7af1e4
Change-Id: I0e0d68409c95da42f5609920155ba5694ade8df0