phases: stop using `repo.set` in `remotephasessummary` The `repository.set` create changectx on the fly, an expensive operation. Using `repo.revs` and a direct rev-num → node-id translation will be significantly faster. This is especially true as we prepare ourself to no longer do the rev-num → node-id transalation there. The speedup is a bit lost in the overall noisyness of the slow phase discovery algorithm, but it save a small amount of time in my benchmark.

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Test issue2761

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  $ hg init repo

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  $ cd repo

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  $ touch to-be-deleted

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  $ hg add

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  adding to-be-deleted

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  $ hg ci -m first

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  $ echo a > to-be-deleted

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  $ hg ci -m second

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  $ rm to-be-deleted

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  $ hg diff -r 0

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Same issue, different code path

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  $ hg up -C

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ touch does-not-exist-in-1

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  $ hg add

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  adding does-not-exist-in-1

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  $ hg ci -m third

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  $ rm does-not-exist-in-1

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  $ hg diff -r 1