IVGCVSW-7854 Remove/rewrite asserts in the backends.

* Identify usages of ARMNN_ASSERT that should be proper exceptions.
* Change ARMNN_ASSERT in Doctests to CHECK.
* Verify any remaining assertions are reasonable.

Signed-off-by: Colm Donelan <colm.donelan@arm.com>
Change-Id: Ifd1f2a5a4bb60135e8654305035ec70e09c4dc2d
diff --git a/src/backends/tosaCommon/operatorMappings/ElementwiseUnaryOperator.cpp b/src/backends/tosaCommon/operatorMappings/ElementwiseUnaryOperator.cpp
index 17ea64b..02dddab 100644
--- a/src/backends/tosaCommon/operatorMappings/ElementwiseUnaryOperator.cpp
+++ b/src/backends/tosaCommon/operatorMappings/ElementwiseUnaryOperator.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright © 2023 Arm Ltd and Contributors. All rights reserved.
+// Copyright © 2023-2024 Arm Ltd and Contributors. All rights reserved.
 // SPDX-License-Identifier: MIT
 //
 
@@ -44,8 +44,6 @@
             throw armnn::Exception("ConvertElementwiseUnaryToTosaOperator: Unsupported layer type.");
     }
 
-    ARMNN_ASSERT(op != nullptr);
-
     std::vector<TosaSerializationTensor*> tensors;
     // Only add input tensor if connected layer is an input layer.
     // As intermediate or constant tensors will be created separately.