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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#require rustfmt test-repo

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  $ . "$TESTDIR/helpers-testrepo.sh"

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  $ cd "$TESTDIR"/..

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Warning: Keep this in sync with hghave.py

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  $ RUSTFMT=$(rustup which --toolchain nightly-2021-11-02 rustfmt)

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  $ for f in `testrepohg files 'glob:**/*.rs'` ; do

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  >   $RUSTFMT --check --edition=2018 --unstable-features --color=never $f

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  > done