RFR: 8327794: RISC-V: enable extension features based on impid (Rivos specific change)

[Fei Yang]

On Mon, 11 Mar 2024 13:10:34 GMT, Hamlin Li <mli at openjdk.org> wrote:

> > Hi Hamlin, Could you please merge master? That will retrigger the GHA testing automatically and hopefully pass linux-cross-compile for linux-riscv64.
> 
> Done.

Hmm ... Seems that the new GHA run blocked. But the changes looks OK.

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PR Comment: https://git.openjdk.org/jdk/pull/18191#issuecomment-1989741205