RFR: 8284196: RISC-V: Detect supported ISA extensions over cpuinfo [v2]

[Feilong Jiang]

On Tue, 7 Feb 2023 05:34:32 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Feilong Jiang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix typo
>
> src/hotspot/os_cpu/linux_riscv/vm_version_linux_riscv.cpp line 100:
> 
>> 98:   }
>> 99: }
>> 100: 
> 
> Can you add a comment here about how the 'isa' substring with those extensions look like?

Fixed. Add an example of isa string and explain how multi-letter extensions are separated.

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PR: https://git.openjdk.org/jdk/pull/12343