RadeonSI Polaris: Mesa 12.0 vs. 13.0 vs. 17.0 vs. 17.1 Git

With Mesa 17.1 branching this weekend I figured it would be a fun Easter running benchmarks of Mesa Git compared to previous branches with a Radeon RX 470 Polaris graphics card. Here are these Mesa 17.1 benchmarks while other tests and on more GPUs is forthcoming.