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MLBEDSW-9267: Fix incorrect Shape hash affecting tensor cache

Philip Hall requested to merge MLBEDSW-9267_1 into main

The tensor cache was seen to be holding duplicate encoded tensors all with the same parameters but a different key hash. This turned out to be a fault in the Shape hash (which always combined 4 fields regardless of actual shape rank) generating unstable values for 3-axis architecture ublocks.

  • Updated Shape hash to incorporate only all valid axes.

Signed-off-by: Philip Hall philip.hall@arm.com Change-Id: Iae11eeec0eb343caf77e8149b968ba53ba7d8afc

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