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10-30% perf drop in CPU bound Driver2 GPU tests

Between following drm-tip commits:

  • b91870e9a2: drm-tip: 2019y-11m-24d-17h-04m-33s UTC integration manifest
  • 6e08331c45: drm-tip: 2019y-11m-25d-15h-20m-51s UTC integration manifest

GfxBench Driver2 tests performance dropped 10-30% on GEN9 devices I'm running tests on. Drop was largest on SkullCanyon. There are smaller performance drops in other partly CPU bound 3D benchmarks (e.g. 5-10% in GLBenchmark Egypt on BXT).

During same interval, there was also marginal perf improvement in offscreen versions of GfxBench Manhattan 3.0 & 3.1 tests.

(Driver2 test is supposed to do similar GL calls as Manhattan tests, just with much more lightweight GPU load.)

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