[riscv-port-jdk11u:riscv-port] RFR: 8284937: riscv: should not allocate special register for temp

[Fei Yang]

On Thu, 28 Mar 2024 10:09:33 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, please help review this backport to riscv-port-jdk11u.
> Backport of [JDK-8284937](https://bugs.openjdk.org/browse/JDK-8284937). The original patch cannot be directly applied because riscv-port-jdk11u doesn't have riscv_v.ad and doesn't have c2_MacroAssembler, which uses MacroAssembler.
> 
> Testing:
> 
> - [x] Run tier1-3 tests on SOPHON SG2042 (release)

Looks good.

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Marked as reviewed by fyang (Lead).

PR Review: https://git.openjdk.org/riscv-port-jdk11u/pull/17#pullrequestreview-1967734261