message: Minor change to eliminate a compile warning
  Summary:
  (Fixing issue https://github.com/facebook/redex/issues/485)
  The C++ compiler throws a warning when a `^` operator is used between expression and not properly parenthesized.
  This fixes it
diff: @@ -202,7 +202,7 @@ class Edge final {
  void set_src(Block* b) { m_src = b; }
  void set_target(Block* b) { m_target = b; }
  void set_type(EdgeType new_type) {
  - always_assert_log(!(m_type == EDGE_THROW ^ new_type == EDGE_THROW),
  + always_assert_log(!((m_type == EDGE_THROW) ^ (new_type == EDGE_THROW)),
  "Can't convert to or from throw edge");
  m_type = new_type;
  }
  