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intel: performance and memory bugs in INTEL_MEASURE

Mark Janes requested to merge majanes/mesa:intel_measure_bugs into main

@fjdegroo reported a two bugs that occur when collecting timing data with INTEL_MEASURE:

  • On iris, memory is leaked because data structures are not re-used or freed
  • On anv, workloads that use a large number of small command buffers pay a heavy penalty for allocations of data structures storing timing data.

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