[vectorIntrinsics+compress] RFR: 8274975: Add micro benchmark: ALIBABA selective store use case [v2]

[Joshua Zhu]

> I separate my implementation of "compress" API into several patches for easy review.
> This micro benchmark is extracted from the real use case inside in-memory databases: selectiveStore.
> Test scenario: UseAVX=3; thread number = 8; conflict data percentage: 20% (that means 20% of mask bits are true)

Joshua Zhu has updated the pull request incrementally with one additional commit since the last revision:

  update

-------------

Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/149/files
  - new: https://git.openjdk.java.net/panama-vector/pull/149/files/9390edfe..c4d51d6f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=149&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=149&range=00-01

  Stats: 129 lines in 1 file changed: 18 ins; 69 del; 42 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/149.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/149/head:pull/149

PR: https://git.openjdk.java.net/panama-vector/pull/149