RFR: 8324304: RISC-V: add hw probe flags [v4]

[Fei Yang]

On Sun, 28 Jan 2024 09:28:47 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Hi,
>> Can you help to review this simple patch to add hw probe flags?
>> Thanks!
>> 
>> Per https://github.com/torvalds/linux/blob/master/arch/riscv/include/uapi/asm/hwprobe.h, several extensions were already added in kernel code, we have several intrinsics or funtionalities depends on these extension, it's ready to add these hw probe flags already used in jdk into jdk code.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add flags only without enablement

Thanks.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17519#pullrequestreview-1847737995