IVGCVSW-6420: Constant flag in tensor info is not set correctly

!android-nn-driver:6532
!armnn-internal-tests:372451

  * Made fix to 2 out of 3 ConstTensor() constructors in Tensor.hpp to
    throw InvalidArgumentException when TensorInfo isConstant parameter
    is false.
  * Added new ConstTensor() constructor in Tensor.cpp to accept vector<>.data()
    using template<typename MemoryType>.
  * Fixed runtime->GetOutputTensorInfo()/GetInputTensorInfo() methods and
    called submethods to return TensorInfo& rather than TensorInfo.
  * Fixed all failing unit tests for CpuRef/CpuAcc/GpuAcc to ensure any
    ConstTensor created has it's TensorInfo isConstant set to true.
  * Added unit tests in TensorTest.cpp to ensure ConstTensor constructors
    throw InvalidArgumentException when TensorInfo isConstat parameter is
    false.
  * Added unit test to ensure an empty ConstTensor constructor will set
    TensorInfo isConatant to true.
  * Indentation fixes.
  * Fix to arm_tensor.i to add isConstant parameter to TensorInfo
    constructor. Added methods IsConstant() and SetConstant().
  * Fix to const_tensor.py to throw ValueError when TensorInfo
    isConstant is set to false when constructing a ConstTensor.
  * Fixed PyArmnn unit tests to set TensorInfo isConstant to
    True when ConstTensor is used.
  * Added unit tests in test_const_tensor.py to ensure ConstTensor
    constructors throw ValueError when TensorInfo isConstat parameter
    is false.

Signed-off-by: Cathal Corbett <cathal.corbett@arm.com>
Change-Id: I44e440dd0422c366d31bbdbc77ad2b4db0bde148
diff --git a/src/backends/backendsCommon/test/DetectionPostProcessEndToEndTestImpl.hpp b/src/backends/backendsCommon/test/DetectionPostProcessEndToEndTestImpl.hpp
index a566964..c448886 100644
--- a/src/backends/backendsCommon/test/DetectionPostProcessEndToEndTestImpl.hpp
+++ b/src/backends/backendsCommon/test/DetectionPostProcessEndToEndTestImpl.hpp
@@ -82,10 +82,13 @@
 
     boxEncodingsInfo.SetQuantizationScale(boxScale);
     boxEncodingsInfo.SetQuantizationOffset(boxOffset);
+    boxEncodingsInfo.SetConstant(true);
     scoresInfo.SetQuantizationScale(scoreScale);
     scoresInfo.SetQuantizationOffset(scoreOffset);
+    scoresInfo.SetConstant(true);
     anchorsInfo.SetQuantizationScale(anchorScale);
     anchorsInfo.SetQuantizationOffset(anchorOffset);
+    anchorsInfo.SetConstant(true);
 
     // Builds up the structure of the network
     armnn::INetworkPtr net = CreateDetectionPostProcessNetwork<T>(boxEncodingsInfo, scoresInfo,