IVGCVSW-6455 Support Const + Dequantize layer and optimize it.

* Support Float16 as input to Dequantize layer
* Add Optimization to substitute Const+Dequantize layers with Const layer

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>

Change-Id: I58bb7e3871ca480c7b6fca93c4efb2de84e09e64
Signed-off-by: David <david.monahan@arm.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e67c389..903f06c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -528,6 +528,7 @@
         src/armnn/test/ObservableTest.cpp
         src/armnn/test/OptimizerTests.cpp
         src/armnn/test/optimizations/AddBroadcastReshapeLayerTests.cpp
+        src/armnn/test/optimizations/ConvertConstDequantisationLayersToConstLayersTest.cpp
         src/armnn/test/optimizations/ConvertConstantsBFloatTests.cpp
         src/armnn/test/optimizations/ConvertConstantsFloatToHalfTests.cpp
         src/armnn/test/optimizations/ConvertConstantsHalfToFloatTests.cpp