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Greatly improve time of no-op warming of tags-fnode-cache from an already warm cache

Pierre-Yves David requested to merge topic/stable/tag-cache-perf into branch/stable

Combined speedup is great, see individual commit for details.

### data-env-vars.name           = mercurial-2018-08-01-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 1.711778 
93a6dcd5d843: 0.165577  (-90.33%)
### data-env-vars.name           = mercurial-filtered-2019-11-22-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 5.596320 
93a6dcd5d843: 1.071618  (-80.85%)
### data-env-vars.name           = mozilla-central-2018-08-01-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 18.884656 
93a6dcd5d843: 0.923128  (-95.11%)
### data-env-vars.name           = mozilla-try-2019-02-18-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 88.924823 
93a6dcd5d843: 4.507316  (-94.93%)
### data-env-vars.name           = netbeans-2018-08-01-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 13.574141 
93a6dcd5d843: 0.645026  (-95.25%)
### data-env-vars.name           = pypy-2018-08-01-zstd-sparse-revlog
  # benchmark.name               = debug-update-cache
  # bin-env-vars.hg.flavor       = rust
  # benchmark.variants.pre-state = warm
c65553d18ab0: 4.010817 
93a6dcd5d843: 0.268654  (-93.30%)
Edited by Pierre-Yves David

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