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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2015-12-14 19:37:43 +00:00

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