IVGCVSW-4211 Add Signed 8 bit Quantisation support into the Reference backend

!android-nn-driver:2435

Signed-off-by: Finn Williams <Finn.Williams@arm.com>
Change-Id: I10ecd4a8937725953396805f33a3562a5384c4d4
diff --git a/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.cpp b/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.cpp
index 6a3e852..844b109 100644
--- a/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.cpp
+++ b/src/backends/backendsCommon/test/layerTests/DequantizeTestImpl.cpp
@@ -143,6 +143,13 @@
     return DequantizeOffsetTest<armnn::DataType::QuantisedAsymm8>(workloadFactory, memoryManager);
 }
 
+LayerTestResult<float, 4> DequantizeSimpleInt8Test(
+        armnn::IWorkloadFactory& workloadFactory,
+        const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager)
+{
+    return DequantizeSimpleTest<armnn::DataType::QSymmS8>(workloadFactory, memoryManager);
+}
+
 LayerTestResult<float, 4> DequantizeSimpleInt16Test(
     armnn::IWorkloadFactory& workloadFactory,
     const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager)
@@ -158,6 +165,13 @@
                                                                                             memoryManager);
 }
 
+LayerTestResult<armnn::Half, 4> DequantizeSimpleInt8ToFp16Test(
+        armnn::IWorkloadFactory& workloadFactory,
+        const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager)
+{
+    return DequantizeSimpleTest<armnn::DataType::QSymmS8, armnn::DataType::Float16>(workloadFactory, memoryManager);
+}
+
 LayerTestResult<armnn::Half, 4> DequantizeSimpleInt16ToFp16Test(
     armnn::IWorkloadFactory& workloadFactory,
     const armnn::IBackendInternal::IMemoryManagerSharedPtr& memoryManager)