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

[Gui Cao]

On Tue, 26 Mar 2024 08:35:05 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)

This pull request has now been integrated.

Changeset: d4b0021a
Author:    Gui Cao <gcao at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
URL:       https://git.openjdk.org/riscv-port-jdk11u/commit/d4b0021ac15c36f1cc5d5bae34b79b9d2ddc1182
Stats:     194 lines in 12 files changed: 133 ins; 53 del; 8 mod

8291893: riscv: remove fence.i used in user space
8291947: riscv: fail to build after JDK-8290840
8310656: RISC-V: __builtin___clear_cache can fail silently.

Reviewed-by: fyang, luhenry
Backport-of: 5a539e8da7dbea1eaa10d799f75199ea359f7a22

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PR: https://git.openjdk.org/riscv-port-jdk11u/pull/16