MLBEDSW-9142 Add support for fusing activation functions to chains
- Allow fusing multiple activations to chains as long as they are not consecutive.
- Allow fusing of int16 Simoid and Tanh.
- Utilize all 8 LUT slots rather than reusing slot 0 every time.
- Extended live-range fusing to allow reusing IFM/OFM across opgroups.
Change-Id: Idce158551b23f4ea3824e662a045759d4e609a60 Signed-off-by: Jacob Bohlin jacob.bohlin@arm.com