Cleanup for cgFloatForYogaFloat (#1571)

- Return CGFloat
- Proper check for YGUndefined
- Add YGUndefined default return value

Source/Layout/ASYogaUtilities.mm

@@ -117,9 +117,9 @@ float yogaFloatForCGFloat(CGFloat value)
   }
 }
 
-float cgFloatForYogaFloat(float yogaFloat)
+CGFloat cgFloatForYogaFloat(float yogaFloat, CGFloat undefinedDefault)
 {
-  return (yogaFloat == YGUndefined) ? CGFLOAT_MAX : yogaFloat;
+  return YGFloatIsUndefined(yogaFloat) ? undefinedDefault : yogaFloat;
 }
 
 float yogaDimensionToPoints(ASDimension dimension)
@@ -213,8 +213,8 @@ YGSize ASLayoutElementYogaMeasureFunc(YGNodeRef yogaNode, float width, YGMeasure
   id <ASLayoutElement> layoutElement = (__bridge id <ASLayoutElement>)YGNodeGetContext(yogaNode);
   ASDisplayNodeCAssert([layoutElement conformsToProtocol:@protocol(ASLayoutElement)], @"Yoga context must be <ASLayoutElement>");
 
-  width = cgFloatForYogaFloat(width);
-  height = cgFloatForYogaFloat(height);
+  width = cgFloatForYogaFloat(width, CGFLOAT_MAX);
+  height = cgFloatForYogaFloat(height, CGFLOAT_MAX);
 
   ASSizeRange sizeRange;
   sizeRange.min = CGSizeZero;