`tile_state`, which stats the metatile and the planet timestamp, was called 
from both `tile_storage_hook` and `add_expiry`. When the tile is current, we 
can reuse that stat unchanged instead of statting again. Small speedup of ~5% 
to Apache CPU time per tile request.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/520

-- Commit Summary --

  * stat a current tile once per request

-- File Changes --

    M includes/mod_tile.h (1)
    M src/mod_tile.c (5)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/520.patch
https://github.com/openstreetmap/mod_tile/pull/520.diff

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