[vectorIntrinsics] RFR: 8253680: Vector API VectorMask and VectorSpecies tests for coverage

[Sandhya Viswanathan]

8253680: Vector API VectorMask and VectorSpecies tests for coverage

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Commit messages:
 - Fix jcheck issues
 - 8253680: Vector API VectorMask and VectorSpecies tests for coverage

Changes: https://git.openjdk.java.net/panama-vector/pull/9/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=9&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253680
  Stats: 4697 lines in 33 files changed: 4697 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/9.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/9/head:pull/9

PR: https://git.openjdk.java.net/panama-vector/pull/9