[jdk25u] RFR: 8361504: RISC-V: Make C1 clone intrinsic platform guard more specific

[Fei Yang]

On Wed, 23 Jul 2025 15:35:14 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [54e37629](https://github.com/openjdk/jdk/commit/54e37629f63eae7800415fa22684e6b3df3648ec) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Feilong Jiang on 9 Jul 2025 and was reviewed by Fei Yang and Gui Cao.
> 
> Thanks!

GHA failure (PPC64 linux cross compile job) is unrelated.

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PR Comment: https://git.openjdk.org/jdk25u/pull/29#issuecomment-3120988333