Make two separate yoga targets for QE

Summary: Setup QE for yoga perf changes

Reviewed By: emilsjolander

Differential Revision: D7059278

fbshipit-source-id: dd11b018edc8ea930d5eba09c6c01e349bb8b63c

java/com/facebook/yoga/YogaConfig.java

@@ -16,7 +16,11 @@ public class YogaConfig {
   public static int SPACING_TYPE = 1;
 
   static {
-    SoLoader.loadLibrary("yoga");
+    if (YogaConstants.shouldUseFastMath) {
+      SoLoader.loadLibrary("yogafastmath");
+    } else {
+      SoLoader.loadLibrary("yoga");
+    }
   }
 
   long mNativePointer;

java/com/facebook/yoga/YogaConstants.java

@@ -11,6 +11,8 @@ public class YogaConstants {
 
   public static final float UNDEFINED = Float.NaN;
 
+  public static boolean shouldUseFastMath = false;
+
   public static boolean isUndefined(float value) {
     return Float.compare(value, UNDEFINED) == 0;
   }

java/com/facebook/yoga/YogaNode.java

@@ -17,7 +17,11 @@ import javax.annotation.Nullable;
 public class YogaNode implements Cloneable {
 
   static {
-    SoLoader.loadLibrary("yoga");
+    if (YogaConstants.shouldUseFastMath) {
+      SoLoader.loadLibrary("yogafastmath");
+    } else {
+      SoLoader.loadLibrary("yoga");
+    }
   }
 
   /**