IVGCVSW-4482 Remove boost::ignore_unused

!referencetests:229377

Signed-off-by: Jan Eilers <jan.eilers@arm.com>
Change-Id: Ia9b360b4a057fe7bbce5b268092627c09a0dba82
diff --git a/src/backends/backendsCommon/test/layerTests/SliceTestImpl.cpp b/src/backends/backendsCommon/test/layerTests/SliceTestImpl.cpp
index 09f15c0..df3b623 100644
--- a/src/backends/backendsCommon/test/layerTests/SliceTestImpl.cpp
+++ b/src/backends/backendsCommon/test/layerTests/SliceTestImpl.cpp
@@ -29,7 +29,7 @@
     const float qScale = 1.0f,
     const int qOffset = 0)
 {
-    boost::ignore_unused(memoryManager);
+    IgnoreUnused(memoryManager);
     if(armnn::IsQuantizedType<T>())
     {
         inputInfo.SetQuantizationScale(qScale);