RFR: 8295948: Support for Zicbop/prefetch instructions on RISC-V [v9]

[Fei Yang]

On Thu, 10 Nov 2022 11:01:48 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> The OpenJDK supports generating prefetch instructions on most platforms. RISC-V supports through the Zicbop extension the use of prefetch instructions. We want to make sure we use these instructions whenever they are available.
>> 
>> It passes `hotspot:tier1` test suite
>
> Ludovic Henry has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by fyang (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10884