[8u] RFR (XS) 8260236: better init AnnotationCollector _contended_group

[Aleksey Shipilev]

Original fix:
   https://bugs.openjdk.java.net/browse/JDK-8260236
   https://github.com/openjdk/jdk/commit/fd2641ed

Unfortunately, this does not apply to 8u cleanly, because the AnnotationProcessor is still in .hpp 
in 8u.

Therefore, 8u variant is:

diff -r b0825e3772d3 src/share/vm/classfile/classFileParser.hpp
--- a/src/share/vm/classfile/classFileParser.hpp        Mon Apr 20 13:34:04 2015 +0200
+++ b/src/share/vm/classfile/classFileParser.hpp        Mon Mar 15 18:59:42 2021 +0100
@@ -1,7 +1,7 @@
  /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
@@ -137,11 +137,11 @@
      const Location _location;
      int _annotations_present;
      u2 _contended_group;

      AnnotationCollector(Location location)
-    : _location(location), _annotations_present(0)
+    : _location(location), _annotations_present(0), _contended_group(0)
      {
        assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
      }
      // If this annotation name has an ID, report it (or _none).
      ID annotation_index(ClassLoaderData* loader_data, Symbol* name);


Testing: Linux x86_64 build

-- 
Thanks,
-Aleksey