RFR: 8199138: Add RISC-V support to Zero

[Erik Joelsson]

Build changes look ok to me. Someone from hotspot should review the cpp 
file.

/Erik

On 2020-02-12 08:14, John Paul Adrian Glaubitz wrote:
> Hi!
>
> This is an updated RFR to add basic RISC-V support to Zero.
>
> This patch is being used for the riscv64 port in Debian.
>
> Please review the changes in [1].
>
> Thanks,
> Adrian
>
>> [1] http://cr.openjdk.java.net/~glaubitz/8199138/webrev.00/