[jdk23u] RFR: 8333652: RISC-V: compiler/vectorapi/VectorGatherMaskFoldingTest.java fails when using RVV

[Gui Cao]

Hi, The same issue also exists in the JDK23U: I can reproduce it locally and use this clean patch can fix that issue, So I would like to backport this to JDK23U. This is a risc-v specific change. Backport is clean, risk is low.

### Testing
- [ ] test/jdk/jdk/incubator/vector on Banana Pi BPI-F3 board (with RVV1.0)

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

Commit messages:
 - Backport ce5727df4436425b24b89f24c6e6b708575ec7c6

Changes: https://git.openjdk.org/jdk23u/pull/2/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=2&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333652
  Stats: 86 lines in 2 files changed: 70 ins; 2 del; 14 mod
  Patch: https://git.openjdk.org/jdk23u/pull/2.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/2/head:pull/2

PR: https://git.openjdk.org/jdk23u/pull/2