rust-dirstatemap: add missing @propertycache While investigating a regression on `hg update` performance introduced by the Rust `dirstatemap`, two missing `@propertycache` were identified when comparing against the Python implementation. This adds back the first one, that has no observable impact on behavior. The second one (`nonnormalset`) is going to be more involved, as the caching has to be done from the Rust side of things. Differential Revision: https://phab.mercurial-scm.org/D8047

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Set up

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  $ hg init repo

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  $ cd repo

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Try to import an empty patch

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  $ hg import --no-commit - <<EOF

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  > EOF

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  applying patch from stdin

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  abort: stdin: no diffs found

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  [255]

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No dirstate backups are left behind

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  $ ls .hg/dirstate* | sort

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  .hg/dirstate

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