RFR: 8286301: Port JEP 425 to RISC-V [v5]

[Fei Yang]

On Fri, 4 Nov 2022 09:37:39 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> @reinrich : Yes, you are right about the frame layout of RISC-V. And your proposed solution looks reasonable to me. Since that will need testing accross all platforms, maybe we can do that as a separate PR later on after this is merged. The RISCV testing platform is relatively slow and this PR has been tested for a long time. Thanks.
>
> @RealFYang I'm ok with leaving this for later. The change is actually rather small. I've added it to the PPC64 port with https://github.com/openjdk/jdk/pull/10961/commits/0d12b0577d8314ed1d571d9cac65fa8866939180
> Quick tests succeeded on X86, AARCH64 and PPC64.

@reinrich : That's great to hear. Thank you. After this PR is merged, I can help test your changes on RISC-V when you rebase.

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PR: https://git.openjdk.org/jdk/pull/10917