RFR: 8295382: Implement SHA-256 Intrinsic on RISC-V

[Fei Yang]

On Thu, 26 Jan 2023 01:47:10 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

> This has been tested with patches currently being submitted to QEMU to add support for Zvkb and Zvknha extensions.
> 
> The documentation for the Vector Crypto extension's instructions is available at https://github.com/riscv/riscv-crypto/tree/master/doc/vector/insns

But looks like this extension is still in draft status? We should only consider using RISC-V extensions that are at least in the ratified status. Extensions in draft status are expected to change before ratification.

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PR: https://git.openjdk.org/jdk/pull/12208