Auto merge of #25864 - mrobinson:rename-layout, r=jdm

Rename AbsolutelyPositionedBox::layout to AbsolutelyPositionedBox::to_hoisted

This method doesn't actually do any layout, but converts this block to a
HoistedAbsolutelyPositionedBox which is hoisted and then laid-out with
its containing block later. This makes the code a little easier to read.

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