Boone Gorges 4732139799 Don't use array_merge() when building comment children arrays.
`array_merge()` is much slower than building the combined array using a
`foreach` loop. The performance difference was causing a speed regression with
the `get_children()` functionality introduced in 4.4.

Props rogerhub.
Fixes #35025.

git-svn-id: https://develop.svn.wordpress.org/trunk@35931 602fd350-edb4-49c9-b593-d223f7449a82
2015-12-14 19:36:05 +00:00
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