RFR: 8361829: [TESTBUG] RISC-V: compiler/vectorization/runner/BasicIntOpTest.java fails when using RVV without using zvbb

[Dingli Zhang]

Hi all,
Please take a look and review this PR, thanks!

After JDK-8355293 , compiler/vectorization/runner/BasicIntOpTest.java fails when using RVV without using zvbb.
The reason for the error is that PopCountVI on RISC-V requires zvbb, not justrvv.

### Test
- [x] Run compiler/vectorization/runner/BasicIntOpTest.java on k1
- [x] Run compiler/vectorization/runner/BasicIntOpTest.java on qemu-system (enable RVV) w/ and w/o zvbb

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Commit messages:
 - 8361829: [TESTBUG] RISC-V: compiler/vectorization/runner/BasicIntOpTest.java fails when using RVV without using zvbb

Changes: https://git.openjdk.org/jdk/pull/26238/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26238&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361829
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26238.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26238/head:pull/26238

PR: https://git.openjdk.org/jdk/pull/26238