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

[Fei Yang]

On Mon, 31 Oct 2022 11:29:36 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
>
> @RealFYang let me know what you think. Thanks!

@luhenry : Sorry for late reply. I am looking this this now.

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