RFR: 8330094: RISC-V: Save and restore FCSR in the call stub [v3]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> As discussed at https://github.com/openjdk/jdk/pull/17745#discussion_r1558783467, we should do the similar thing as [JDK-8319973](https://bugs.openjdk.org/browse/JDK-8319973) on aarch64.
> Thanks!
> 
> Tests running ...

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

  refine code

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18758/files
  - new: https://git.openjdk.org/jdk/pull/18758/files/0e7b2414..7da4b991

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18758&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18758&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18758.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18758/head:pull/18758

PR: https://git.openjdk.org/jdk/pull/18758