[vectorIntrinsics] RFR: 8343779: Cannot build Vector API JMH benchmarks on vectorIntrinsics branch

[Mikhail Ablakatov]

To generate pseudo-random values, the benchmarks mostly reference the
Random RAND object. However, occasionally RANDOM is referenced instead
of RAND. The mismatch causes build errors.

Reference RAND across Vector API JMH benchmarks consistently.

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Commit messages:
 - 8343779: Cannot build Vector API JMH benchmarks on vectorIntrinsics branch

Changes: https://git.openjdk.org/panama-vector/pull/221/files
  Webrev: https://webrevs.openjdk.org/?repo=panama-vector&pr=221&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343779
  Stats: 78 lines in 39 files changed: 0 ins; 0 del; 78 mod
  Patch: https://git.openjdk.org/panama-vector/pull/221.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector.git pull/221/head:pull/221

PR: https://git.openjdk.org/panama-vector/pull/221