[vectorIntrinsics+compress] RFR: 8274889: Intrinsify Vector.expand/compress APIs for X86 [v3]

[Jatin Bhateja]

> - Common C2 compiler entry point for compress/expand APIs.
> - Inline expansion handling and C2 graph creation.
> - For X86 current backed support is added for AVX512 which offers direct compress/expand instructions.
> 
> Patch has been co-contributed by  Joshua Zhu  (@Alibaba)

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  8274889: Post merge IR cleanup and special case handling for allTrue mask.

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

Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/146/files
  - new: https://git.openjdk.java.net/panama-vector/pull/146/files/9fc8d771..0d1e7c32

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=146&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=146&range=01-02

  Stats: 243 lines in 40 files changed: 188 ins; 25 del; 30 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/146.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/146/head:pull/146

PR: https://git.openjdk.java.net/panama-vector/pull/146