RFR: 8315195: RISC-V: Update hwprobe query for new extensions [v2]

[Robbin Ehn]

On Wed, 30 Aug 2023 08:08:06 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   pre-6.5 kernel support
>
> src/hotspot/os_cpu/linux_riscv/riscv_hwprobe.cpp line 147:
> 
>> 145:   if (is_set(RISCV_HWPROBE_KEY_IMA_EXT_0, RISCV_HWPROBE_EXT_ZBS)) {
>> 146:     VM_Version::ext_Zbs.enable_feature();
>> 147:   }
> 
> Hi, I think we should move JVM options for those RV extensions out of `EXPERIMENTAL` once they are auto-enabled like this. It should be OK at least for options like UseRVV, UseZba, UseZbb and UseZbs as they have been baked for quite some time.

Yes, sure:
https://bugs.openjdk.org/browse/JDK-8315338

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PR Review Comment: https://git.openjdk.org/jdk/pull/15465#discussion_r1309927885