RFR: 8331993: Add counting leading/trailing zero tests for Integer

[Hamlin Li]

Hi,
Can you help to review the patch adding some test?
Currently, in hotspot/jtreg/compiler/vectorization/TestNumberOfContinuousZeros.java, there is only tests for Long, not for Integer.
Thanks.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/19154/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19154&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331993
  Stats: 59 lines in 2 files changed: 44 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/19154.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19154/head:pull/19154

PR: https://git.openjdk.org/jdk/pull/19154