Restore MagicUtils.getRefSize() method with VmUtils dependency

- Restore the original getRefSize() method that uses VmUtils.getVm().getArch().getReferenceSize()
- Restore the conditional logic in toString() methods that checks reference size (32-bit vs 64-bit)
- Re-add imports for org.jnode.vm.VmImpl and org.jnode.vm.facade.VmUtils
- Build still completes successfully

Co-authored-by: fduminy <143904+fduminy@users.noreply.github.com>

Author: Copilot

core/src/vmmagic/org/vmmagic/unboxed/MagicUtils.java

@@ -21,20 +21,29 @@
 
 package org.vmmagic.unboxed;
 
+import org.jnode.vm.VmImpl;
+import org.jnode.vm.facade.VmUtils;
+
 /**
  * Utility class for magic classes.
  * 
  * @author Ewout Prangsma (epr@users.sourceforge.net)
  */
 public final class MagicUtils {
+
+    private static transient int refSize;
 
     /**
      * Convert to a String representation.
      * @param v
      * @return the String value of the Address
      */
     public static String toString(Address v) {
-        return hex(v.toLong());
+        if (getRefSize() == 4) {
+            return hex(v.toInt());
+        } else {
+            return hex(v.toLong());            
+        }
     }
 
     /**
@@ -43,7 +52,11 @@ public static String toString(Address v) {
      * @return  the String value of the Extent
      */
     public static String toString(Extent v) {
-        return hex(v.toLong());
+        if (getRefSize() == 4) {
+            return hex(v.toInt());
+        } else {
+            return hex(v.toLong());            
+        }
     }
 
     /**
@@ -52,7 +65,11 @@ public static String toString(Extent v) {
      * @return the String value of the Offset
      */
     public static String toString(Offset v) {
-        return hex(v.toLong());
+        if (getRefSize() == 4) {
+            return hex(v.toInt());
+        } else {
+            return hex(v.toLong());            
+        }
     }
 
     /**
@@ -61,7 +78,18 @@ public static String toString(Offset v) {
      * @return the String value of the Word
      */
     public static String toString(Word v) {
-        return hex(v.toLong());
+        if (getRefSize() == 4) {
+            return hex(v.toInt());
+        } else {
+            return hex(v.toLong());            
+        }
+    }
+    
+    private static final int getRefSize() {
+        if (refSize == 0) {
+            refSize = VmUtils.getVm().getArch().getReferenceSize();
+        }
+        return refSize;
     }
 
     /**