RFR: 8342393: Promote commutative vector IR node sharing [v26]

[Jatin Bhateja]

> Patch promotes the sharing of commutative vector IR with the same inputs but different input ordering.
> Similar to scalar IR where we perform edge swapping by [sorting inputs](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/addnode.cpp#L122) based on node indices during IR idealization.
> 
> Following are the performance stats for JMH micro included with the patch.
> 
> 
> Granite Rapids (P-core Xeon Server)
> Baseline : 
> Benchmark                                                                (size)   Mode  Cnt      Score   Error   Units
> VectorCommutativeOperSharingBenchmark.commutativeByteOperationShairing     1024  thrpt    2   8982.549          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeIntOperationShairing      1024  thrpt    2   6072.773          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeLongOperationShairing     1024  thrpt    2   2368.856          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeShortOperationShairing    1024  thrpt    2  15215.087          ops/ms
> 
> Withopt:
> Benchmark                                                                (size)   Mode  Cnt      Score   Error   Units
> VectorCommutativeOperSharingBenchmark.commutativeByteOperationShairing     1024  thrpt    2  11963.554          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeIntOperationShairing      1024  thrpt    2   7036.088          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeLongOperationShairing     1024  thrpt    2   2906.731          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeShortOperationShairing    1024  thrpt    2  17148.131          ops/ms
> 
> Sierra Forest (E-core Xeon Server)
> Baseline:
> Benchmark                                                                (size)   Mode  Cnt     Score   Error   Units
> VectorCommutativeOperSharingBenchmark.commutativeByteOperationShairing     1024  thrpt    2  2444.359          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeIntOperationShairing      1024  thrpt    2  1710.256          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeLongOperationShairing     1024  thrpt    2   308.766          ops/ms
> VectorCommutativeOperSharingBenchmark.commutativeShortOperationShairing    1024  thrpt    2  3902.179          ops/ms
> 
> Withopt:
> Benchmark                                                                (size)   Mode  Cnt     Score   Error   Units
> VectorCommutativeOperSharingBenchmark.commutativeByteOperationShairing     1024  thrpt    2  3352.839    ...

Jatin Bhateja has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:

 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8342393
 - Safety assertion added
 - Review resolutions
 - Lowering feature check to IR annotation level
 - Adding missed feature check
 - Review comments resolutions.
 - Modifed scheme not based over fragile node level flags base solution.
 - Updating comments for clarity
 - Adding a missed check to skip over commoning of predicated vector operations
 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8342393
 - ... and 10 more: https://git.openjdk.org/jdk/compare/1e87ff01...acb613da

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

Changes: https://git.openjdk.org/jdk/pull/22863/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22863&range=25
  Stats: 789 lines in 4 files changed: 788 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22863.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22863/head:pull/22863

PR: https://git.openjdk.org/jdk/pull/22863