8335357: Delete HotSpotJDKReflection.oopSizeOffset

Reviewed-by: dnsimon

Author: Gergö Barany

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotJDKReflection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -108,9 +108,6 @@ boolean equals(HotSpotObjectConstantImpl a, HotSpotObjectConstantImpl b) {
         return resolveObject(a) == resolveObject(b) && a.isCompressed() == b.isCompressed();
     }
 
-    // This field is being kept around for compatibility with libgraal
-    @SuppressWarnings("unused") private long oopSizeOffset;
-
     @Override
     ResolvedJavaMethod.Parameter[] getParameters(HotSpotResolvedJavaMethodImpl javaMethod) {
         java.lang.reflect.Parameter[] javaParameters = getMethod(javaMethod).getParameters();