RFR: 8330266: RISC-V: Restore frm to RoundingMode::rne after JNI [v3]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> As discussed at: https://github.com/openjdk/jdk/pull/18758#pullrequestreview-1999982333, we'd better to do it.
> Similar thing is done on aarch64, https://bugs.openjdk.org/browse/JDK-8320892
> 
> Thanks

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

  minor refinement

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18785/files
  - new: https://git.openjdk.org/jdk/pull/18785/files/59a488d7..68964755

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18785&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18785&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18785.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18785/head:pull/18785

PR: https://git.openjdk.org/jdk/pull/18785