ITSGPU: further optimisations - #15704
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Signed-off-by: Felix Schlepper <felix.schlepper@cern.ch>
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reduce ITS tracking time by:
kernel tracking tracks
original 14.315 16.63 3,607,941
final 8.062 10.42 3,607,941
-37.7% -32.0%
fixes also a race condition in the findRoads step which leads to clusters used multiple times.
Needs #15703