[riscv-port-jdk17u:riscv-port] RFR: 8291947: riscv: fail to build after JDK-8290840

[Fei Yang]

On Thu, 16 Mar 2023 03:10:55 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Please review this backport to riscv-port-jdk17u.
> Backport of [JDK-8291947](https://bugs.openjdk.org/browse/JDK-8291947). 
> In the current version, https://bugs.openjdk.org/browse/JDK-8290840 has not been refactored, so the issues corresponding to the original issue do not exist. compared to the original patch, the icache_flush function is removed in a different location.
> 
> Testing:
> - Tier1 passed without new failure on unmacthed (release).

Looks OK.

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Marked as reviewed by fyang (Committer).

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/15