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1e25fb5996193524bf2f75781f1e6bdcdf972a3a by Gennadiy Rozental <rogeeff@google.com>:

Introduce enums to represent lower and upper thresholds for LogSeverity.

PiperOrigin-RevId: 417414673

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abfddb3a6ad8ce4849fbb6dadb34d7d6295def0f by Abseil Team <absl-team@google.com>:

Restore __arch64__ macro check for SPARC

PiperOrigin-RevId: 416798208

PiperOrigin-RevId: 416688543
GitOrigin-RevId: 1e25fb5996193524bf2f75781f1e6bdcdf972a3a
Change-Id: I424dd98e5e07420d5f9dfd191f2bfc06036e2bd1