[riscv-port-jdk11u:riscv-port] RFR: 8291893: riscv: remove fence.i used in user space [v2]

[Gui Cao]

On Wed, 27 Mar 2024 08:23:15 GMT, Gui Cao <gcao at openjdk.org> wrote:

>> Please help review this backport to riscv-port-jdk11u.
>> Backport of [JDK-8291893](https://bugs.openjdk.org/browse/JDK-8291893)
>> 
>> In addition to the backport [8291947](https://bugs.openjdk.org/browse/JDK-8291947), [8310656](https://bugs.openjdk.org/browse/JDK-8310656) to align and minimize the difference with 17u upstream.
>> 
>> Testing:
>> 
>> - [x] Run tier1-3 tests on SOPHON SG2042 (release)
>
> Gui Cao has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:
> 
>   8310656: RISC-V: __builtin___clear_cache can fail silently.

> Let's make sure we backport [openjdk/jdk at faf1b82](https://github.com/openjdk/jdk/commit/faf1b822d03b726413d77a2b247dfbbf4db7d57e) as well as it's a fix for the commit you're backporting here.

Hi, Thanks for your review. I've backported [8310656](https://bugs.openjdk.org/browse/JDK-8310656) and added a new commit.

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/16#issuecomment-2022271957