GPU performance tuning of "HZB SetupMips" (As seen in GPU Visualizer)

Development Platform & Builds Debugging, Optimization, & Profiling
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Some tests later : Instanced Stereo Mode downs the time for base pass from 3.16 to 1.03, but scales up the HZB thing from 2.8 to 4.2.
With the 4.16 preview3, the results are similar with or without Instanced Stereo : 2,6-3 for base pass, 4,08-4,18 for HZB.