[vectorIntrinsics+mask] RFR: 8273264: AArch64: [vector] Add missing rules for VectorMaskCast [v2]

[Eric Liu]

> This patch
> 1. Adds missing rules for VectorMaskCast for compatible species, E.g.
>    ByteVector.SPECIES_64 --> ShortVector.SPECIES_128
> 2. Fixes a matching failure on AArch64.
> 
> The performance improves about 60% compared with the unintrinsified
> version.

Eric Liu has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - small fix
   
   Change-Id: I4f5b75c498a3daadf9938e64be5021c43068af67
 - Merge remote-tracking branch 'upstream/vectorIntrinsics+mask' into masked-cast
   
   Change-Id: I5f9e0f627090bb914d496b757091461dbd6a7f72
 - 8273264: AArch64: [vector] Add missing rules for VectorMaskCast
   
   This patch
   1. Adds missing rules for VectorMaskCast for compatible species, E.g.
      ByteVector.SPECIES_64 --> ShortVector.SPECIES_128
   2. Fixes a matching failure on AArch64.
   
   The performance improves about 60% compared with the unintrinsified
   version.
   
   Change-Id: I1bcfc5a09b93c5f4625f39bd3b6a146154f69ad7

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

Changes:
  - all: https://git.openjdk.java.net/panama-vector/pull/124/files
  - new: https://git.openjdk.java.net/panama-vector/pull/124/files/9e3ef6bd..84761ce0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=124&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=124&range=00-01

  Stats: 845 lines in 16 files changed: 731 ins; 29 del; 85 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/124.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/124/head:pull/124

PR: https://git.openjdk.java.net/panama-vector/pull/124