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in_memory: Fix quadratic run time in snapshot_get_branches.

vlorentz requested to merge generated-differential-D3484-source into generated-differential-D3484-target

snapshot.branches is now an ImmutableDict, which is backed by a tuple of tuples; so random accesses now take a linear time instead of a constant time.

This commit replaces random accesses with a single scan of all the items, and does existence checks in a set instead.

Migrated from D3484 (view on Phabricator)

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