[vectorIntrinsics] RFR: Fix benchmark compilation failiure

[Paul Sandoz]

Add `CompressExpandTest` class to benchmarks to fix compilation failure.

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Commit messages:
 - Fix benchamrk compilation failiure.

Changes: https://git.openjdk.java.net/panama-vector/pull/191/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=191&range=00
  Stats: 7 lines in 2 files changed: 0 ins; 4 del; 3 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/191.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/191/head:pull/191

PR: https://git.openjdk.java.net/panama-vector/pull/191