[riscv-port-jdk11u:riscv-port] RFR: 8283865: riscv: Break down -XX:+UseRVB into seperate options for each bitmanip extension

[Gui Cao]

On Mon, 25 Mar 2024 11:28:01 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi, The same issue[1] also exists in the riscv-port-jdk11u. According to the spec,  we need to break down UseRVB into two individual options UseZba and UseZbb to enable or disable Zba and Zbb respectively. 
>> 
>> Linux RISCV64 release hotspot/jdk tier1 tests are passed on QEMU with following options:
>>  - [x] +UseZba && +UseZbb
>>  - [x] +UseZba && -UseZbb
>>  - [x] -UseZba && +UseZbb
>
> Backport looks good. Thanks.

@RealFYang : Thanks for the review.

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/13#issuecomment-2019230634