RFR: 8320911: RISC-V: Enable hotspot/jtreg/compiler/intrinsics/chacha/TestChaCha20.java [v3]

[Hamlin Li]

> Hi,
> Can you review this simple patch to enable TestChaCha20.java on riscv?
> Thanks!
> 
> It's missed when working on JDK-8315716, so in this patch also add  `@requires` jtreg tag to make it obvious to spot which arch is supported.

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  refine code by considering os withoug hwprobe auto-detection

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16857/files
  - new: https://git.openjdk.org/jdk/pull/16857/files/9b58dc5b..f4d7ad6d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16857&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16857&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16857.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16857/head:pull/16857

PR: https://git.openjdk.org/jdk/pull/16857