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        "rationale": "Unchanged: --loom-llvm-arith-to-arith is the pass that owns the sampled obligation. lib/Frontend/Raising/LLVMArithToArithPass.cpp registers CountZerosAlias<LLVM::CountLeadingZerosOp, math::CountLeadingZerosOp> and the CountTrailingZeros pair (lines 566-574) and bails out on getIsZeroPoison() (lines 241-253), and test/raise/llvm-arith-to-arith.mlir runs exactly `loom-raise-opt --loom-llvm-arith-to-arith` for the zero_count_aliases case (lines 1, 377-388). No additional pass is required; no other available pass rewrites llvm.intr.ctlz/cttz, so adding one would only perturb the retained spelling."
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