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This change adds implementations of the algorithms in [alg.partition] to
//base/util/ranges.

Bug: 1071094
Change-Id: I4288f35a2ab4e945a233cb282d63d051bfa7ee7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339517
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795372}