COMPMID-492: Port ArithmeticAddition to new validation

Change-Id: I134b5ed6581b42fac6be6311679473b67d1d5bf4
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/85972
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/tests/TypePrinter.h b/tests/TypePrinter.h
index bbccaad..f276f45 100644
--- a/tests/TypePrinter.h
+++ b/tests/TypePrinter.h
@@ -219,6 +219,13 @@
     return os;
 }
 
+inline std::string to_string(const ConvertPolicy &policy)
+{
+    std::stringstream str;
+    str << policy;
+    return str.str();
+}
+
 /** Formatted output of the Reduction Operations. */
 inline ::std::ostream &operator<<(::std::ostream &os, const ReductionOperation &op)
 {
@@ -234,6 +241,13 @@
     return os;
 }
 
+inline std::string to_string(const ReductionOperation &op)
+{
+    std::stringstream str;
+    str << op;
+    return str.str();
+}
+
 /** Formatted output of the activation function type. */
 inline ::std::ostream &operator<<(::std::ostream &os, const ActivationLayerInfo::ActivationFunction &act_function)
 {
@@ -279,13 +293,6 @@
     return os;
 }
 
-inline std::string to_string(const ReductionOperation &op)
-{
-    std::stringstream str;
-    str << op;
-    return str.str();
-}
-
 inline std::string to_string(const ActivationLayerInfo::ActivationFunction &function)
 {
     std::stringstream str;