Fix UInt/Int Condition Reduction (PS4/X1 issue) (#96)

* Fix missing type copy in reduce

Tested locally on a PS4

* Add expection to detect unsupported value type

Author: PaulDemeulenaere

com.unity.visualeffectgraph/Editor/Expressions/VFXExpressionFlow.cs

@@ -22,6 +22,12 @@ public VFXExpressionCondition()
 
         public VFXExpressionCondition(VFXValueType type, VFXCondition cond, VFXExpression left, VFXExpression right) : base(VFXExpression.Flags.None, new VFXExpression[] { left, right })
         {
+            if (type != left.valueType || type != right.valueType)
+                throw new InvalidOperationException(string.Format("Unexpected value type in condition expression : {0}/{1} (expected {2})", left.valueType, right.valueType, type));
+
+            if (type != VFXValueType.Float && type != VFXValueType.Uint32 && type != VFXValueType.Int32)
+                throw new NotImplementedException("This type is not handled by condition expression: " + type);
+
             condition = cond;
             this.type = type;
         }
@@ -86,6 +92,7 @@ protected override VFXExpression Reduce(VFXExpression[] reducedParents)
         {
             var newExpression = (VFXExpressionCondition)base.Reduce(reducedParents);
             newExpression.condition = condition;
+            newExpression.type = type;
             return newExpression;
         }