RFR: 8286367: riscv: riscv port is broken after JDK-8284161

[Alan Bateman]

On Mon, 9 May 2022 13:02:36 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

> [JDK-8284161](https://bugs.openjdk.java.net/browse/JDK-8284161) implements a preview version of virtual threads on x86_64 and aarch64, and riscv port is broken everywhere. The initial patch is required to make everything on riscv work without "--enable-preview".
> 
> Hotspot/jdk tier1 and all jtreg cases have been tested on Unmatched and Qemu respectively without new failures, except for the "-enable-preview" ones.

Thanks for doing this, I can spsonor it for you.

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PR: https://git.openjdk.java.net/jdk/pull/8595