RFR: 8343030: RISC-V: Small assembler cleanups [v2]

[Hamlin Li]

On Fri, 25 Oct 2024 09:30:41 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi, please review this small code cleanups.
>> 
>> Witnessed some explicit type conversion to `address` is not necessary now.
>> Also we can make use of `void la(Register Rd, const address addr)` where possible to simplify the code.
>> This also adds one temporary register parameter for the `cmpptr` assembler routine.
>> 
>> Testing on linux-riscv64:
>> - [ ] tier1 (release)
>
> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Comment

Marked as reviewed by mli (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21699#pullrequestreview-2394966546