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Use dynamic prefixer on the client side

I noticed that a lot of time is spent running styles through prefixAll.
Although we need to run prefixAll when used on the server, we can be a
bit smarter on the client side of things to improve performance.

Thankfully, since the classNames are generated before prefixing, they
will be stable across server and client even if we use a different
prefixing strategy. This means that we can continue to use prefixAll on
the server and switch out to only prefix the necessary styles on the
client for improved performance.

In my benchmark, this really improves performance in recent Chrome,
bringing my css() runtime down from 1300ms to 900ms.

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