// have that constant argument as the second operand. It works by
// identifying `erf` ops and validate the structure around them.
class OutlineGELU : public RewritePattern {
 public:
  explicit OutlineGELU(MLIRContext* context)
      : RewritePattern(MatchAnyOpTypeTag(), /*benefit=*/1, context) {}

  LogicalResult matchAndRewrite(Operation* op,