[jdk21u] RFR: 8315612: RISC-V: intrinsic for unsignedMultiplyHigh

[Vladimir Kempik]

On Wed, 6 Sep 2023 09:40:03 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [5d3fdc17](https://github.com/openjdk/jdk/commit/5d3fdc1750645455d64a341e1437f779ba3fd20c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Vladimir Kempik on 6 Sep 2023 and was reviewed by Fei Yang.
> 
> Thanks!

tier1 is clean

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PR Comment: https://git.openjdk.org/jdk21u/pull/139#issuecomment-1712183626