ITS: GPU: fix perPrimaryVertexProcessing#15522
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With using the GPU stack allocator, we cannot in the perPrimaryVertexProcessing push to the stack in initialiseTimeFrame since it is only called once while computeLayerTracklets to findRoads is called once per vertex. In findRoads we tried to clear a tag from a previous iteration while the stack is empty leading to a fatal. This fixes that and avoid creating the tracklet LUT buffer on each pass.
f3sch
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fprino,
mconcas,
mcoquet642 and
shahor02
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With using the GPU stack allocator, we cannot in the perPrimaryVertexProcessing-mode push to the stack in initialiseTimeFrame since it is only called once while computeLayerTracklets to findRoads is called once per vertex. In findRoads we tried to clear a tag from a previous iteration while the stack is empty leading to a fatal. This fixes that and avoid creating the tracklet LUT buffer on each pass.