[jdk25u] RFR: 8354348: Enable Extended EVEX to REX2/REX demotion for commutative operations with same dst and src2

Mon Oct 20 16:49:37 UTC 2025

Hi all,

This pull request contains a backport of commit [c41add8d](https://github.com/openjdk/jdk/commit/c41add8d3e24be5f469f18cfbf0f476f2baf63a6) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Srinivas Vamsi Parasa on 16 Sep 2025 and was reviewed by Jatin Bhateja, Emanuel Peter and Sandhya Viswanathan.

Thanks!

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Commit messages:
 - Backport c41add8d3e24be5f469f18cfbf0f476f2baf63a6

Changes: https://git.openjdk.org/jdk25u/pull/328/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=328&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354348
  Stats: 3085 lines in 4 files changed: 518 ins; 169 del; 2398 mod
  Patch: https://git.openjdk.org/jdk25u/pull/328.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/328/head:pull/328

PR: https://git.openjdk.org/jdk25u/pull/328