pan/midgard: Implement blobber-db

pan/midgard: Implement blobber-db

We wire through some shader-db-style stats on the current shader in the
disassemble so we can get a quick estimate of shader complexity from a
trace.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Suggested-by: Rob Clark <robdclark@chromium.org>