RFR: 8290496: riscv: Fix build warnings-as-errors with GCC 11

[Feilong Jiang]

On Tue, 19 Jul 2022 09:10:37 GMT, Yadong Wang <yadongwang at openjdk.org> wrote:

> Try GCC 12 if possible?

I have tried the native release build with GCC 12 (on Ubuntu 22.04, gcc version 12.0.1 20220319 (experimental)). The warning did not appear after this patch.

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PR: https://git.openjdk.org/jdk/pull/9550