[riscv-port-jdk11u:riscv-port] RFR: 8293474: RISC-V: Unify the way of moving function pointer

[Fei Yang]

On Fri, 27 Sep 2024 02:51:15 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk11u.
> Backport of [JDK-8293474](https://bugs.openjdk.org/browse/JDK-8293474).
> Applies not cleanly due to context difference, and changes in `shenandoahBarrierSetAssembler_riscv.cpp` have been modified previously.
> 
> 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/33#pullrequestreview-2356801843