[vectorIntrinsics] RFR: Merge panama-vector:master [v2]

[Paul Sandoz]

> Doing another merge to ensue test configuration is up to date, thereby ensuring test infrastructure configuration is in sync.
> 
> Merge was clean. Local build and test on mac is also clean.
> 
> (Previous attempt selected the wrong base repository!)

Paul Sandoz has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 774 commits:

 - Merge branch 'master' into merge-master-to-vectorIntrinsics
 - Merge panama-vector:vectorIntrinsics+mask
   
   Reviewed-by: eliu, jbhateja
 - 8274342: AArch64: [vector] AArch64 SVE backend code cleanup
   
   Reviewed-by: njian
 - 8274331: [Vector API] Build failure on MacOS after JDK-8273949
   
   Reviewed-by: njian, jbhateja
 - Merge panama-vector:vectorIntrinsics
   
   Reviewed-by: eliu, sviswanathan
 - Merge panama-vector:master
   
   Reviewed-by: jbhateja
 - Merge panama-vector:master
   
   Reviewed-by: eliu
 - Merge panama-vector:master
   
   Reviewed-by: jbhateja, psandoz
 - 8263532: C2: Improve vector box elimination for Phi nodes
   
   Reviewed-by: psandoz
 - 8274236: Cleanups related to X86 masking support.
   
   Reviewed-by: sviswanathan
 - ... and 764 more: https://git.openjdk.java.net/panama-vector/compare/97b28742...62fbeb1e

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

Changes: https://git.openjdk.java.net/panama-vector/pull/137/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=137&range=01
  Stats: 89320 lines in 198 files changed: 83541 ins; 2093 del; 3686 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/137.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/137/head:pull/137

PR: https://git.openjdk.java.net/panama-vector/pull/137