[jdk21u-dev] RFR: 8334078: RISC-V: TestIntVect.java fails after JDK-8332153 when running without RVV

[Gui Cao]

Hi, at [JDK-8334078](https://bugs.openjdk.org/browse/JDK-8334078), modified the matching logic for the linux-riscv64 rvv test, here i would like to backport this to jdk21u-dev, to simplify the subsequent functionality and testing of the backport to jdk21u-dev. This is a risc-v specific change. Backport is clean, risk is low.

### Testing
- [ ] Run tier1-3 tests on SOPHON SG2042 (fastdebug)

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Commit messages:
 - Backport 8334078: RISC-V: TestIntVect.java fails after JDK-8332153 when running without RVV

Changes: https://git.openjdk.org/jdk21u-dev/pull/937/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=937&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334078
  Stats: 7 lines in 2 files changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/937.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/937/head:pull/937

PR: https://git.openjdk.org/jdk21u-dev/pull/937