* tcg8086.a_op_const_reg: perform the OP_AND, OP_OR and OP_XOR optimizations for
  $0000 and $FFFF values on the low and the high words independently.



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26344 3ad0048d-3df7-0310-abae-a5850022a9f2