Elided the TYPE() and msgdef checks by using CLASS_OF.

Author: haberman

ruby/ext/google/protobuf_c/message.c

@@ -697,17 +697,13 @@ bool Message_Equal(const upb_msg *m1, const upb_msg *m2, const upb_msgdef *m) {
  * field is of a primitive type).
  */
 static VALUE Message_eq(VALUE _self, VALUE _other) {
-  if (TYPE(_self) != TYPE(_other)) {
-    return Qfalse;
-  }
+  if (CLASS_OF(_self) != CLASS_OF(_other)) return Qfalse;
 
   Message* self = ruby_to_Message(_self);
   Message* other = ruby_to_Message(_other);
+  assert(self->msgdef == other->msgdef);
 
-  return self->msgdef == other->msgdef &&
-                 Message_Equal(self->msg, other->msg, self->msgdef)
-             ? Qtrue
-             : Qfalse;
+  return Message_Equal(self->msg, other->msg, self->msgdef) ? Qtrue : Qfalse;
 }
 
 uint64_t Message_Hash(const upb_msg* msg, const upb_msgdef* m, uint64_t seed) {