[riscv-port] RFR: 8278337: riscv: remove unnecessary ld/sd zr around calls [v3]

[kuaiwei]

On Thu, 9 Dec 2021 08:22:27 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Looks good.

Thanks.

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PR: https://git.openjdk.java.net/riscv-port/pull/25