[jdk21u-dev] RFR: 8352512: TestVectorZeroCount: counter not reset between iterations

[Martin Doerr]

Clean backport of [JDK-8352512](https://bugs.openjdk.org/browse/JDK-8352512).

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Commit messages:
 - Backport 1c0fa0af7847d80fd3fbe38f28207aab270609b3

Changes: https://git.openjdk.org/jdk21u-dev/pull/1672/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352512
  Stats: 11 lines in 1 file changed: 7 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1672.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1672/head:pull/1672

PR: https://git.openjdk.org/jdk21u-dev/pull/1672