RFR: 8256860: S390 builds broken after JDK-8254231

[Aleksey Shipilev]

On Mon, 23 Nov 2020 16:21:04 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Foreign linker integration broke S390 builds. This change stubs out the new entry points, without implementing the actual support yet.
>> 
>> Additional testing:
>>  - [x] Linux s390x fastdebug cross-compilation
>
> IIUC JDK-8254231 implements support for aarch and x84, which leaves all other architectures (s390, arm, ppc, broken? Thats... :-(
> 
> Thanks a lot for fixing! If your patch fixes the build without having to stub out `ABIDescriptor::is_volatile_reg`, feel free to push.
> 
> Cheers, Thomas

Thanks @tstuefe!

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PR: https://git.openjdk.java.net/jdk/pull/1392