* perform the OP_AND, OP_OR and OP_XOR optimizations for 0 and $FFFF values
  independently also in tcg8086.a_op_const_ref



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26345 3ad0048d-3df7-0310-abae-a5850022a9f2