RFR: 8342393: Promote commutative vector IR node sharing

[Jatin Bhateja]

Patch promotes the sharing of commutative vector IR with the same inputs but different input ordering.
Unlike 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, for vector IR we chose a simpler approach to decorate commutative operations with a special node-level flag during IR construction thus
obviating any dependency on explicit idealization routines. This flag is later used during GVN hashing to enable node sharing.  

Following are the performance stats for JMH 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          ops/ms
VectorCommutativeOperSharingBenchmark.commutativeIntOperationShairing      1024  thrpt    2  2918.805          ops/ms
VectorCommutativeOperSharingBenchmark.commutativeLongOperationShairing     1024  thrpt    2   409.482          ops/ms
VectorCommutativeOperSharingBenchmark.commutativeShortOperationShairing    1024  thrpt    2  6955.057          ops/ms




Please review and share your comments.

Best Regards,
Jatin

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

Commit messages:
 - Adding functional and performance tests
 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8342393
 - 8342393: Initial version

Changes: https://git.openjdk.org/jdk/pull/22863/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22863&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342393
  Stats: 389 lines in 5 files changed: 363 ins; 0 del; 26 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