IVGCVSW-3307 Introduce RefTensorHandle

Use it for intermediate tensors on reference backend.
Lays the groundwork for memory management in the reference backend.

Change-Id: I7d3ee132cac31bde70ae6e1b815f4f0b03d550a6
Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>
diff --git a/src/backends/reference/workloads/RefBatchToSpaceNdWorkload.cpp b/src/backends/reference/workloads/RefBatchToSpaceNdWorkload.cpp
index c293066..c21ef76 100644
--- a/src/backends/reference/workloads/RefBatchToSpaceNdWorkload.cpp
+++ b/src/backends/reference/workloads/RefBatchToSpaceNdWorkload.cpp
@@ -26,4 +26,4 @@
 }
 
 
-} //namespace armnn
\ No newline at end of file
+} //namespace armnn