[Updated] D11964: filelog: add a comment explaining a fast path in filerevisioncopied()

[Alphare (Raphaël Gomès)]

This revision is now accepted and ready to land.
Alphare accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D11964/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D11964

To: SimonSapin, #hg-reviewers, Alphare
Cc: mercurial-patches
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