[riscv-port-jdk17u:riscv-port] RFR: 8293566: RISC-V: Clean up push and pop registers

[Feilong Jiang]

On Wed, 19 Apr 2023 01:37:12 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk17u.
> Backport of [JDK-8293566](https://bugs.openjdk.org/browse/JDK-8293566).
> The original patch cannot be directly applied because 17u already had [JDK-8295396](https://bugs.openjdk.org/browse/JDK-8295396) (which cleanup useless CompressibleRegions) and [JDK-8295968](https://bugs.openjdk.org/browse/JDK-8295968) (which replace vl1r_v with vl1re8_v).
> 
> Testing:
> - Tier1-3 passed without new failure on unmacthed (release).

Marked as reviewed by fjiang (Author).

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PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/45#pullrequestreview-1391353014