[vectorIntrinsics] RFR: 8282942: [vector] Trivial code style updates

[Xiaohong Gong]

This patch mainly fixes some code style issues in the Vector API java codes and the test codes, e.g. adding the missing spaces for some statements.

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Commit messages:
 - 8282942: [vector] Trivial code style updates

Changes: https://git.openjdk.java.net/panama-vector/pull/179/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=179&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282942
  Stats: 15749 lines in 181 files changed: 0 ins; 418 del; 15331 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/179.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/179/head:pull/179

PR: https://git.openjdk.java.net/panama-vector/pull/179