streamclone: stop listing files for entries that have no volatile files This will save a lot of python related time. This significantly boost performance. The following number comes from a large private repository using perf::stream-locked-section: base-line: 35.04 seconds prev-change: 24.51 seconds (-30%) prev-change: 20.88 seconds (-40%) prev-change: 14.22 seconds (-60%) this-change: 11.58 seconds (-67% from baseline; -18% from prev)

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{

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    "version": 1,

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    "project": "mercurial",

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    "project_url": "https://mercurial-scm.org/",

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    "repo": "..",

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    "branches": ["default", "stable"],

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    "environment_type": "virtualenv",

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    "show_commit_url": "https://www.mercurial-scm.org/repo/hg/rev/",

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    "benchmark_dir": "benchmarks",

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    "env_dir": "../.asv/env",

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    "results_dir": "../.asv/results",

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    "html_dir": "../.asv/html"

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}