RFR: 8199138: Add RISC-V support to Zero

[Erik Joelsson]

Build change looks good.

/Erik

On 2020-04-06 11:09, John Paul Adrian Glaubitz wrote:
> Hello!
>
> Please review this small change which adds basic support for the riscv64
> target for Linux/Zero [1].
>
> I have reduced the complexity of the patch as some of the changes from
> the previous change set are not necessary, in particular the changes
> to config.{guess,sub}, the definition of EM_RISCV (which is already defined
> by the Linux kernel headers now provided the kernel is recent enough).
>
> Additionally, I'm leaving the change for os::get_summary_cpu_info() out
> as I would like to clean up this code a bit first - it's rather inconsistent
> considering whether the arch override is used for Hotspot arches only or
> also for Zero arches.
>
> Thanks,
> Adrian
>
>> [1] http://cr.openjdk.java.net/~glaubitz/8199138/webrev.02/