[llvm] [AArch64] Transition from MCSymbolRefExpr::VariantKind constants (PR #133214)

[Peter Smith via llvm-commits]

https://github.com/smithp35 approved this pull request.

LGTM on the ELF side. Would be good to leave the Apple folk some time to look to see if they've got comments.

https://github.com/llvm/llvm-project/pull/133214