RFR: 8346922: TestVectorReinterpret.java fails without the rvv extension on RISCV fastdebug VM

[Gui Cao]

Hi, TestVectorReinterpret.java fails without the rvv extension on RISCV fastdebug VM, on riscv platform need to have rvv extension to run it.

### Testing
- [x] Run TestVectorReinterpret.java tests on SOPHON SG2042 without rvv1.0 (fastdebug)
- [x] Run TestVectorReinterpret.java tests on Banana Pi BPI-F3 board (with RVV1.0) (fastdebug)
- [ ] Run TestVectorReinterpret.java tests on aarch64 with neon
- [ ] Run TestVectorReinterpret.java tests on Xeon(R) Platinum 8378A CPU

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Commit messages:
 - 8346922: TestVectorReinterpret.java fails without the rvv extension

Changes: https://git.openjdk.org/jdk/pull/22901/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22901&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346922
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22901.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22901/head:pull/22901

PR: https://git.openjdk.org/jdk/pull/22901