[Bug 255901] java/openjdk12: Fix possible segfaults with clang 12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255901

            Bug ID: 255901
           Summary: java/openjdk12: 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 224967
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224967&action=edit
Fix java/openjdk12 build with clang 12

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

Creating support/demos/image/jfc/J2Ddemo/J2Ddemo.jar
/usr/local/bin/bash: line 5: 49140 Abort trap              (core dumped)
/wrkdirs/usr/ports/java/openjdk12/work/openjdk-jdk12u-jdk-12.0.2-10-4/build/bsd-x86_64-server-release/support/interim-image/bin/java
-XX:DumpLoadedClassList=/wrkdirs/usr/ports/java/openjdk12/work/openjdk-jdk12u-jdk-12.0.2-10-4/build/bsd-x86_64-server-release/support/link_opt/classlist.raw
-Djava.lang.invoke.MethodHandle.TRACE_RESOLVE=true -cp
/wrkdirs/usr/ports/java/openjdk12/work/openjdk-jdk12u-jdk-12.0.2-10-4/build/bsd-x86_64-server-release/support/classlist.jar
build.tools.classlist.HelloClasslist > /dev/null 2>&1 >
/wrkdirs/usr/ports/java/openjdk12/work/openjdk-jdk12u-jdk-12.0.2-10-4/build/bsd-x86_64-server-release/support/link_opt/default_jli_trace.txt
gmake[4]: *** [GenerateLinkOptData.gmk:66:
/wrkdirs/usr/ports/java/openjdk12/work/openjdk-jdk12u-jdk-12.0.2-10-4/build/bsd-x86_64-server-release/support/link_opt/classlist]
Error 134

This is due to missing backports of commits [2] and [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

commit 34ae46e2bca691f989d4d84129baf545ff8a7469
Author: Andrew Haley <aph at openjdk.org>
Date:   Thu Mar 19 14:53:57 2020 +0000

    8241296: Segfault in JNIHandleBlock::oops_do()

    Reviewed-by: stefank

I have attached a patch that adds these commits as additional patches.

[1]
http://package22.nyi.freebsd.org/data/mainamd64PR255570-default/2021-05-08_16h02m24s/logs/openjdk12-12.0.2+10.4_3.log
[2]
https://github.com/openjdk/jdk/commit/c484d8904285652246c3af212a4211b9a8955149
[3]
https://github.com/openjdk/jdk/commit/34ae46e2bca691f989d4d84129baf545ff8a7469

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