[vectorIntrinsics] RFR: 8282915: Add new vector operation for reverse bits operation [v2]

[Smita Kamath]

> Hi,
> 
> I've added support for new vector operations for reversing bits of integral vector types(Byte/Short/Integer/Long).
> Currently, this PR addresses only Java changes for reverse operation. I've also updated the test framework.
> Do review and share feedback.

Smita Kamath has updated the pull request incrementally with one additional commit since the last revision:

  Removed additional space and addressed special case

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Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/178/files
  - new: https://git.openjdk.java.net/panama-vector/pull/178/files/61d6af27..847584df

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=178&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=178&range=00-01

  Stats: 7 lines in 4 files changed: 6 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/178.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/178/head:pull/178

PR: https://git.openjdk.java.net/panama-vector/pull/178