RFR: 8303955: RISC-V: Factor out the tmp parameter from copy_memory and copy_memory_v

[Feilong Jiang]

On Mon, 13 Mar 2023 01:12:17 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> The call site of `copy_memory` and `copy_memory_v` always use `t0` as tmp register, so we can factor the tmp parameter out.
>> 
>> Testing:
>> 
>> - [x] tier1 tests on Unmatched board (release build with `-XX:-UseRVV`)
>> - [x] hotspot_tier1 and jdk_tier1 on QEMU (release build with `-XX:+UseRVV`)
>
> Looks fine. Thanks.

@RealFYang @yhzhu20 -- Thanks for the review!

-------------

PR: https://git.openjdk.org/jdk/pull/12969