message: fix clang 10 build
diff: @@ -321,8 +321,7 @@ public:
  target_iterator(JumpInstr *instr, unsigned idx) : instr(instr), idx(idx) {}
  const BasicBlock& operator*() const;
  target_iterator& operator++(void) { ++idx; return *this; }
  - bool operator!=(target_iterator &rhs) const { return idx != rhs.idx; }
  - bool operator==(target_iterator &rhs) const { return !(*this != rhs); }
  + bool operator==(const target_iterator &rhs) const { return idx == rhs.idx; }
  };
  class it_helper {
  