8258955: (bf) slice(int, int) on view buffers fails to adjust index according to primitive size

Reviewed-by: alanb

src/java.base/share/classes/java/nio/Direct-X-Buffer.java.template

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, 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
@@ -237,7 +237,8 @@ class Direct$Type$Buffer$RW$$BO$
                                               0,
                                               length,
                                               length,
-                                              index, segment);
+                                              index << $LG_BYTES_PER_VALUE$,
+                                              segment);
     }
 
     public $Type$Buffer duplicate() {