[jdk17u-dev] RFR: 8270848: Redundant unsafe opmask register allocation in some instruction patterns.

Thu Sep 8 11:29:38 UTC 2022

Backport 71ca0c08f09e87673f1cf3f918a0802961359166

The change checks specific avx features instead of common UseAVX flag. 

The change is required for JDK-8281146 backport to land cleanly in x86 ad files.

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

Commit messages:
 - Backport 71ca0c08f09e87673f1cf3f918a0802961359166

Changes: https://git.openjdk.org/jdk17u-dev/pull/657/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=657&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8270848
  Stats: 45 lines in 3 files changed: 0 ins; 4 del; 41 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/657.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/657/head:pull/657

PR: https://git.openjdk.org/jdk17u-dev/pull/657