RFR: 8295382: Implement SHA-256 Intrinsic on RISC-V [v2]

[Ludovic Henry]

> 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

Ludovic Henry has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into dev/ludovic/vector-crypto-sha
 - 8295382: Implement SHA-256 Intrinsic on RISC-V

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Changes: https://git.openjdk.org/jdk/pull/12208/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12208&range=01
  Stats: 536 lines in 5 files changed: 530 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12208.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12208/head:pull/12208

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