[riscv-port] RFR: 8277430: riscv: Refactor interpreter native wrappers

[Fei Yang]

On Mon, 22 Nov 2021 09:53:44 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

> A similar refactor similar to https://bugs.openjdk.java.net/browse/JDK-8261071, to make the code more clean and open for extension. 
> Hotspot and jdk tier1 test passed on unmatched boards. All JTreg tests were tested on qemu without new failures.

Changes requested by fyang (Lead).

src/hotspot/cpu/riscv/interpreterRT_riscv.cpp line 175:

> 173:  private:
> 174:   address   _from;
> 175:   char*     _to;

It would be better to do this change in another commit.

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PR: https://git.openjdk.java.net/riscv-port/pull/12