style fix

Author: spaske00

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/image/NativeImageHeap.java

@@ -934,8 +934,8 @@ int getObjectReachabilityGroup() {
             return objectReachabilityGroup;
         }
 
-        boolean objectReachableFrom(ObjectReachabilityGroup objectReachabilityGroup) {
-            return (this.objectReachabilityGroup & objectReachabilityGroup.flag) != 0;
+        boolean objectReachableFrom(ObjectReachabilityGroup other) {
+            return (this.objectReachabilityGroup & other.flag) != 0;
         }
     }