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cairooverlay: Optimize premultiplication/unpremultiplication loops

Sebastian Dröge requested to merge slomo/gst-plugins-good:cairooverlay-premultiply into master

Pull in video frame fields into local variables. Without this the compiler must assume that they could've changed on every use and read them from memory again.

This reduces the inner loop from 6 memory reads per pixels to 4, and the number of writes stays at 3.

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