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rust-index: simplification in find_gca_candidates()

`parent_seen` can be made a mutable ref, making this part more obvious,
not needing to be commented so much.

The micro-optimization of avoiding the union if `parent_seen` and
`current_seen` agree is pushed down in the `union()` method of the
fast, `u64` based bit set implementation (in case it matters).

# So GitLab doesn't think we're using tons of Perl
*.t -linguist-detectable