RFR: 8324304: RISC-V: add hw probe flags

[Fei Yang]

On Wed, 24 Jan 2024 11:02:27 GMT, Hamlin Li <mli at openjdk.org> wrote:

> It makes sense, removed UPDATE_DEFAULT for these extensions.

Thanks for the update. Would you mind one more tweak? I think we should also remove the auto-enablement of `UseZic64b`, `UseZicbom`, `UseZicbop` and `UseZihintpause` which are also experimental options for now.

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PR Comment: https://git.openjdk.org/jdk/pull/17519#issuecomment-1909619843