RFR: 8292575: riscv: Represent Registers as values [v4]

[Fei Yang]

On Tue, 30 Aug 2022 01:24:17 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> Follow up [JDK-8292153](https://bugs.openjdk.org/browse/JDK-8292153) and [JDK-8292203](https://bugs.openjdk.org/browse/JDK-8292203), migrate away from pointer-based representation of Register values.
>> 
>> It improves compile-time checking by forbidding implicit conversions between integrals and pointers.
>> 
>> Testing:
>> - hotspot/jdk tier1 on unmatched board
>> - hotspot/jdk tier1 on qemu
>
> Feilong Jiang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Merge branch 'master' of https://github.com/openjdk/jdk into riscv-register-rep
>  - remove duplicate code
>  - Merge branch 'master' of https://github.com/openjdk/jdk into riscv-register-rep
>  - Represent Registers as values

Updated changes look good. Thanks.

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Marked as reviewed by fyang (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9936