Placeholder text disappears in mdInput with overflow and column-count style

[bhelzer]

In an element with overflow set to auto, and an inner element with column-count set to 1 or 2, the placeholder text of an mdInput element is not visible, except during animation.

http://embed.plnkr.co/6NxPVlVeRVeVpOQeKnNk/

Chome, Angular 4.0, material 1.0 beta 1

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