[vectorIntrinsics] RFR: 8283316: Add new vector operation REVERSE_BYTES

[Swati Sharma]

Hi All,

Summary of changes:
a) Java implementation of new vector operation REVERSE_BYTES for all  integral types.
b) Extended existing JTREG and JMH suite with test points corresponding to new operations.

Please review and share your feedback.

Thanks,
Swati

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Commit messages:
 - 8283316: Add new vector operation REVERSE_BYTES

Changes: https://git.openjdk.java.net/panama-vector/pull/181/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=181&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283316
  Stats: 1922 lines in 78 files changed: 1922 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/181.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/181/head:pull/181

PR: https://git.openjdk.java.net/panama-vector/pull/181