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MLBEDSW-11193: Fix constprop when whole graph is constant

Johan Gunnarsson requested to merge MLBEDSW-11193 into main

If all input to ta graph is constant, the graph should be replaced by a single memory copy that copies a constant tensor to the graph outout. Previously every op was removed and the graph output was converted to a constant tensor. Empty graphs are problematic for us since there is nothing left that writes to graph output.

Signed-off-by: Johan Gunnarsson johan.gunnarsson@arm.com Change-Id: Ifdcd66ed14e772f6d8b37e3e3b110dede8222277

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