RFR: 8365772: RISC-V: correctly prereserve NaN payload when converting from float to float16 in vector way [v2]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> 
> This is a follow-up of https://github.com/openjdk/jdk/pull/26838, fixes the vector version in a similar way.
> 
> Thanks!

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

  comments & readability

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26883/files
  - new: https://git.openjdk.org/jdk/pull/26883/files/446a403b..fa107180

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26883&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26883&range=00-01

  Stats: 30 lines in 1 file changed: 24 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/26883.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26883/head:pull/26883

PR: https://git.openjdk.org/jdk/pull/26883