RFR: 8319716: RISC-V: Add SHA-2 [v6]

[Robbin Ehn]

> Hi, please consider.
> 
> Main author is @luhenry, I only fixed some minor things and tested it.
> 
> Such as:
> test/hotspot/jtreg/compiler/intrinsics/sha/
> test/jdk/java/security/MessageDigest/
> test/jdk/jdk/security/
> tier1
> 
> And still running some test.

Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:

  Removed swap file

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16562/files
  - new: https://git.openjdk.org/jdk/pull/16562/files/283f186f..c92975e0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16562&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16562&range=04-05

  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16562.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16562/head:pull/16562

PR: https://git.openjdk.org/jdk/pull/16562