message: Qualify string in constructor
diff: @@ -129,7 +129,8 @@ Value* GetBinaryOp<lhlo::MaxOp>(::mlir::Type element_type, ::mlir::Location loc,
  template <typename LhloOp>
  struct BinaryOpConverter : public ::mlir::RewritePattern {
  - explicit BinaryOpConverter(const string& opname, ::mlir::MLIRContext* context)
  + explicit BinaryOpConverter(const std::string& opname,
  + ::mlir::MLIRContext* context)
  : RewritePattern(opname, {}, 1, context), opname(opname) {}
  ::mlir::PatternMatchResult matchAndRewrite(
  