RFR: 8306667: RISC-V: Fix storeImmN0 matching rule by using zr register

[Xiaolin Zheng]

On Fri, 21 Apr 2023 13:12:15 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> btw, should this also be backported to 17u-riscv ? after this PR is done

Sure, I can do that after verifying and merging this patch.

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PR Comment: https://git.openjdk.org/jdk/pull/13577#issuecomment-1517893838