[vectorIntrinsics+compress] RFR: 8274839: Intrinsic support for compress & expand VectorAPI [v2]

[Joshua Zhu]

> I separate my implementation of "compress" API into several patches for easy review.
> This change is the intrinsic support for compress/expand API.
> The intrinsic method "selectiveOp" in VectorSupport accepts boolean to indicate expansion or compression.

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/145/files
  - new: https://git.openjdk.java.net/panama-vector/pull/145/files/bb211a0d..e1f6f5d4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=145&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=145&range=00-01

  Stats: 25 lines in 3 files changed: 0 ins; 16 del; 9 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/145.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/145/head:pull/145

PR: https://git.openjdk.java.net/panama-vector/pull/145