[riscv-port] RFR: 8278337: riscv: remove unnecessary ld/sd zr around calls [v2]

[Fei Yang]

On Wed, 8 Dec 2021 12:49:39 GMT, kuaiwei <duke at openjdk.java.net> wrote:

> >
>
> Hi Felix, the patch passed tier1 test in qemu with fastdebug build.

Thank you. Could you please add this to the PR description?

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