Github #123 Catch exceptions by reference

Change-Id: Ie664cb7127434ad9c7a03c4a31f3c71fdebd49b9
Signed-off-by: Matthew Bentham <Matthew.Bentham@arm.com>
diff --git a/src/armnn/LayerSupport.cpp b/src/armnn/LayerSupport.cpp
index 484251c..12b3c40 100644
--- a/src/armnn/LayerSupport.cpp
+++ b/src/armnn/LayerSupport.cpp
@@ -58,7 +58,7 @@
             isSupported = layerSupportObject->func(__VA_ARGS__, Optional<std::string&>(reasonIfUnsupportedFull)); \
             CopyErrorMessage(reasonIfUnsupported, reasonIfUnsupportedFull.c_str(), reasonIfUnsupportedMaxLength); \
         } \
-    } catch (InvalidArgumentException e) { \
+    } catch (const InvalidArgumentException &e) { \
         /* re-throwing with more context information */ \
         throw InvalidArgumentException(e, "Failed to check layer support", CHECK_LOCATION()); \
     } \