Boone Gorges 6ce4e413ce Invalidate comment query cache when modifying comment meta.
Comment queries are sensitive to comment meta due to the `meta_query`
parameter, so the cache must be invalidated when comment meta is changed,
added, or deleted.

Props spacedmonkey.
See #40669.

git-svn-id: https://develop.svn.wordpress.org/trunk@41848 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-12 14:58:58 +00:00
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