Make coefficient skip condition an explicit RD choice.
This commit replaces zrun_zbin_boost, a method of biasing non-zero coefficients following runs of zero-coefficients to be rounded towards zero, with an explicit skip-block choice in the RD loop. The logic is basically that if individual coefficients should be rounded towards zero (from a RD point of view), the trellis/optimize loop should take care of it. If whole blocks should be zero (from a RD point of view), a single RD check is much more efficient than a complete serialization of the quantization loop. Quality change: derf +0.5% psnr, +1.6% ssim; yt +0.6% psnr, +1.1% ssim. SIMD for quantize will follow in a separate patch. Results for other test sets pending. Change-Id: Ife5fa641163ac5150ac428011e87188f1937c1f4