8360303: Remove two unused invoke files

Reviewed-by: rriggs, jrose

Author: liach

src/java.base/share/classes/java/lang/invoke/InvokeDynamic.java

@@ -36,7 +36,6 @@
 import jdk.internal.vm.annotation.ForceInline;
 import jdk.internal.vm.annotation.Hidden;
 import jdk.internal.vm.annotation.Stable;
-import sun.invoke.empty.Empty;
 import sun.invoke.util.ValueConversions;
 import sun.invoke.util.VerifyType;
 import sun.invoke.util.Wrapper;
@@ -983,7 +982,7 @@ static MethodHandle throwException(MethodType type) {
         return makePairwiseConvert(getFunction(NF_throwException).resolvedHandle(), type, false, true);
     }
 
-    static <T extends Throwable> Empty throwException(T t) throws T { throw t; }
+    static <T extends Throwable> Void throwException(T t) throws T { throw t; }
 
     static MethodHandle[] FAKE_METHOD_HANDLE_INVOKE = new MethodHandle[2];
     static MethodHandle fakeMethodHandleInvoke(MemberName method) {

src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, 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
@@ -26,7 +26,6 @@
 package sun.invoke.util;
 
 import java.lang.invoke.MethodType;
-import sun.invoke.empty.Empty;
 
 /**
  * This class centralizes information about the JVM verifier
@@ -93,8 +92,6 @@ public static boolean isNullType(Class<?> type) {
         // Therefore, it can be safely treated as a value of any
         // other type that admits null, i.e., a reference type.
         if (type == Void.class)  return true;
-        // Locally known null-only class:
-        if (type == Empty.class)  return true;
         return false;
     }