Use varHandle instead of offset for reading data off VWT

Author: ktoso

SwiftKit/src/main/java/org/swift/swiftkit/SwiftKit.java

@@ -20,6 +20,7 @@
 import java.io.IOException;
 import java.lang.foreign.*;
 import java.lang.invoke.MethodHandle;
+import java.lang.invoke.VarHandle;
 import java.nio.file.CopyOption;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
@@ -437,6 +438,14 @@ public static long getSwiftInt(MemorySegment memorySegment, long offset) {
         }
     }
 
+    public static long getSwiftInt(MemorySegment memorySegment, VarHandle handle) {
+        if (SwiftValueLayout.SWIFT_INT == ValueLayout.JAVA_LONG) {
+            return (long) handle.get(memorySegment, 0);
+        } else {
+            return (int) handle.get(memorySegment, 0);
+        }
+    }
+
 
     private static class swift_getTypeName {