Use double for YGRoundValueToPixelGrid calculations

Summary:
Use double for YGRoundValueToPixelGrid calculations as we were losing some precision in float operations

#Changelog:
[Internal][Yoga] Use double for YGRoundValueToPixelGrid calculations

Reviewed By: astreet

Differential Revision: D18225999

fbshipit-source-id: 69c05f56a0e0f3433bf0bd958aa07d26dd83fe02

ReactCommon/yoga/yoga/Yoga.cpp

@@ -3650,7 +3650,7 @@ YOGA_EXPORT float YGRoundValueToPixelGrid(
     const float pointScaleFactor,
     const bool forceCeil,
     const bool forceFloor) {
-  float scaledValue = value * pointScaleFactor;
+  double scaledValue = ((double) value) * pointScaleFactor;
   // We want to calculate `fractial` such that `floor(scaledValue) = scaledValue
   // - fractial`.
   float fractial = fmodf(scaledValue, 1.0f);