* bignum.c (bigor_int): Use RB_GC_GUARD.
  (bigxor_int): Take xn and hibitsx arguments.  Use twocomp2abs_bang.
  (rb_big_xor): Use abs2twocomp and twocomp2abs_bang.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41692 b2dd03c8-39d4-4d8f-98ff-823fe69b080e