drm/i915/cmdparser: Use binary search for faster register lookup
A significant proportion of the cmdparsing time for some batches is the cost to find the register in the mmiotable. We ensure that those tables are in ascending order such that we could do a binary search if it was ever merited. It is. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NMatthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-38-chris@chris-wilson.co.uk
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