WordPress/wp-includes
Boone Gorges b6dbe1cea9 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.
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git-svn-id: http://core.svn.wordpress.org/trunk@35895 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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