[riscv-port-jdk17u:riscv-port] RFR: 8291893: riscv: remove fence.i used in user space [v3]

[Fei Yang]

On Thu, 16 Mar 2023 08:26:52 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

>> Please review this backport to riscv-port-jdk17u.
>> Backport of [JDK-8291893](https://bugs.openjdk.org/browse/JDK-8291893).
>> 
>> The original patch cannot be directly applied because of the line number, but there are no other additional changes.
>> 
>> Testing:
>> - Tier1 passed without new failure on unmacthed (release).
>
> Dingli Zhang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
> 
>  - Merge branch 'riscv-port' into backport-JDK-8291893
>  - rebase
>  - 8291893: riscv: remove fence.i used in user space

Looks good.

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Marked as reviewed by fyang (Committer).

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/13