tags-cache: directly perform a monimal walk for hgtagsfnodescache warming We do something narrower than the path retrieving data. So lets use dedicated code instead. This provides further useful speedup: ### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog # benchmark.name = hg.debug.debug-update-cache # bin-env-vars.hg.flavor = default # bin-env-vars.hg.py-re2-module = default # benchmark.variants.pre-state = warm before-this-series: 19.947581 skip-fnode-filter: 18.916804 (-5.17%, -1.03) use-rev-num: 17.493725 (-12.30%, -2.45) this-changesets: 15.919466 (-20.19%, -4.03)

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https://bz.mercurial-scm.org/612

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  $ hg init repo

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  $ cd repo

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  $ mkdir src

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  $ echo a > src/a.c

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  $ hg ci -Ama

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  adding src/a.c

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  $ hg mv src source

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  moving src/a.c to source/a.c

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  $ hg ci -Ammove

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  $ hg co -C 0

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

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  $ echo new > src/a.c

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  $ echo compiled > src/a.o

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  $ hg ci -mupdate

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  created new head

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  $ hg status

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  ? src/a.o

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  $ hg merge

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  merging src/a.c and source/a.c to source/a.c

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

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  (branch merge, don't forget to commit)

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  $ hg status

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  M source/a.c

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  R src/a.c

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  ? src/a.o

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