[riscv-port-jdk11u:riscv-port] RFR: 8290137: riscv: small refactoring for add_memory_int32/64

[Fei Yang]

On Wed, 11 Sep 2024 03:59:46 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk11u.
> Backport of [JDK-8290137](https://bugs.openjdk.org/browse/JDK-8290137). Applies not cleanly because [JDK-8339248](https://bugs.openjdk.org/browse/JDK-8339248) remove li64 macro assembler routine and related code. 
> 
> So I removed the changes of the li64 macro assembler routine. In addition to this there was an extra modification to `add_memory_int32` in `c1_MacroAssembler_riscv.cpp`.
> 
> Testing:
> - Tier1 passed without new failure on lp4a (release).

Marked as reviewed by fyang (Lead).

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PR Review: https://git.openjdk.org/riscv-port-jdk11u/pull/30#pullrequestreview-2299054022