[jdk21] RFR: 8310656: RISC-V: __builtin___clear_cache can fail silently.

[Robbin Ehn]

On Sun, 2 Jul 2023 18:35:30 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [faf1b822](https://github.com/openjdk/jdk/commit/faf1b822d03b726413d77a2b247dfbbf4db7d57e) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Robbin Ehn on 2 Jul 2023 and was reviewed by Ludovic Henry, Thomas Stuefe and Fei Yang.
> 
> Thanks!

I missed clicking yes on collab in time, I can't push to this branch.
I'll close and test backport again.

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PR Comment: https://git.openjdk.org/jdk21/pull/90#issuecomment-1624117057