[Bug 255900] java/openjdk11 java/openjdk11-jre: Fix possible segfaults with clang 12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255900

            Bug ID: 255900
           Summary: java/openjdk11 java/openjdk11-jre: Fix possible
                    segfaults with clang 12
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: java at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: java at FreeBSD.org
             Flags: maintainer-feedback?(java at FreeBSD.org)

Created attachment 224966
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224966&action=edit
Fix java/openjdk11 (and openjdk11-jre) builds with clang 12

During an exp-run for llvm 12 (see bug 255570), it turned out that
java/openjdk11 and java/openjdk11-jre do not build with clang 12.0.0 [1]:

Creating interim jimage
Compiling 2 files for BUILD_DEMO_Notepad
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00000008024be650, pid=58260, tid=148291
#
# JRE version: OpenJDK Runtime Environment (11.0.10+9) (build 11.0.10+9-1)
# Java VM: OpenJDK 64-Bit Server VM (11.0.10+9-1, mixed mode, tiered,
compressed oops, g1 gc, bsd-amd64)
# Problematic frame:
# V  [libjvm.so+0x6be650]  Arena::destruct_contents()+0x80

This is due to a missing backport of this commit [3]:

commit c484d8904285652246c3af212a4211b9a8955149
Author: Thomas Stuefe <stuefe at openjdk.org>
Date:   Tue Mar 16 05:49:01 2021 +0000

    8263557: Possible NULL dereference in Arena::destruct_contents()

    Reviewed-by: kbarrett, coleenp

I have attached a patch that adds this commit as an additional patch.

[1]
http://package22.nyi.freebsd.org/data/mainamd64PR255570-default/2021-05-08_16h02m24s/logs/openjdk11-11.0.10+9.1_1.log
[2]
http://package22.nyi.freebsd.org/data/mainamd64PR255570-default/2021-05-08_16h02m24s/logs/openjdk11-jre-11.0.10+9.1_1.log
[3]
https://github.com/openjdk/jdk/commit/c484d8904285652246c3af212a4211b9a8955149

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