[llvm-branch-commits] [llvm] release/18.x: [SystemZ] Require D12 for i128 accesses in isLegalAddressingMode() (#79221) (PR #83022)

[Ulrich Weigand via llvm-branch-commits]

https://github.com/uweigand approved this pull request.

LGTM.  This should be backported as a fixes a regression with i128 support.

https://github.com/llvm/llvm-project/pull/83022