RFR: 8290280: riscv: Clean up stack and register handling in interpreter

[Feilong Jiang]

On Thu, 14 Jul 2022 08:31:16 GMT, Andrew Haley <aph at openjdk.org> wrote:

> This looks reasonable. Don't forget that JDK-8289698 will be needed when you have support for virtual threads.

@theRealAph Thanks for your kind reminder, we will take care of it.

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PR: https://git.openjdk.org/jdk/pull/9487