RFR: 8284949: riscv: Add Zero support for the 32-bit RISC-V architecture [v2]

[Magnus Ihse Bursie]

On Tue, 19 Apr 2022 08:47:18 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> This patch adds Zero support for the 32-bit RISC-V architecture.
>> 
>> Additional tests:
>> 
>> - [x] Linux zero RISCV32 cross-compilation
>> - [x] Resulting binaries run on QEMU User mode without problems
>
> Feilong Jiang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   adjust SYS_futex define for RISCV32

Marked as reviewed by ihse (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8284