Slightly improve performance of NoiseFunction2

src/test/java/NoiseTest.java

@@ -0,0 +1,28 @@
+import com.dfsek.terra.generation.config.NoiseBuilder;
+import com.dfsek.terra.math.NoiseFunction2;
+import org.junit.jupiter.api.Test;
+import parsii.eval.Expression;
+
+import java.util.Arrays;
+
+public class NoiseTest {
+    @Test
+    public void noise() {
+        NoiseFunction2 noiseFunction = new NoiseFunction2(12345, new NoiseBuilder());
+
+        for(int i = 0; i < 10; i++) {
+            long l = System.nanoTime();
+            for(int j = 0; j < 1000000; j++) {
+                noiseFunction.eval(Arrays.asList(get(j), get(i)));
+                noiseFunction.eval(Arrays.asList(get(j), get(i)));
+                noiseFunction.eval(Arrays.asList(get(j), get(i)));
+            }
+            double n = System.nanoTime() - l;
+            System.out.println(n / 1000000 + "ms");
+        }
+    }
+
+    private Expression get(double val) {
+        return () -> val;
+    }
+}