vp9: Avoid encoder loopfilter for non-reference frames.
Useful for SVC, where the top layer enhancement frames may not update any reference buffers, as is the case for the patterns in the 1 pass CBR SVC when #temporal_layers > 1. ~3% encoder speedup for SVC patterns with temporal layers in 1 pass CBR mode. Updated the SVC datarate tests for the mismatch frames. Set the frame-dropper off in some tests with #temporal_layers > 1 so we can correctly set #mismatch frames. Adjusted rate target threshold for tests where frame-dropper was turned off. Change-Id: Ia0c142f02100be0fed61cd2049691be9c59d6793
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