[riscv-port-jdk11u:riscv-port] RFR: 8285303: riscv: Incorrect register mask in call_native_base

[Fei Yang]

On Mon, 1 Apr 2024 04:06:54 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, please help review this backport to riscv-port-jdk11u.
> Backport of [JDK-8285303](https://bugs.openjdk.org/browse/JDK-8285303). Applies cleanly.
> 
> Testing:
> 
> - [x]  Run tier1-3 tests on SOPHON SG2042 (release)

Marked as reviewed by fyang (Lead).

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PR Review: https://git.openjdk.org/riscv-port-jdk11u/pull/18#pullrequestreview-1972508310