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MLBEDSW-11217: Refactor Rescale fusability checks into functions

Alexander Bengtsson requested to merge MLBEDSW-11217 into main
  • Abstract rescale-fusing constraints into separate functions. These abstractions simplify the main pass and remove redundancy when attempting to binary IFM-fuse. CanBeFused:
    • Generic checks to determine whether a rescale operation can be fused onto any operation. CanFuseRescaleOnProducer
    • Check if a rescale can be fused onto a specific producer. CanFuseRescaleOnConsumer:
    • Check if a rescale can be fused onto a specific consumer. CanFuseMultipleRescalesOnConsumer
    • Checks for binary IFM-fusing when unary IFM-fusing fails.

Signed-off-by: Alexander Bengtsson Alexander.Bengtsson@arm.com Change-Id: I0064753fbe258a7e9d00b4c337960b2aae10369f

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