* config/m68hc11/m68hc11.c (print_operand): Handle 'b' modifier
for D register to specify the low part of it, aka B.
(m68hc11_gen_movhi): Use REG_WAS_0 note and increment or decrement
the register if we are loading 1 or -1 to it; avoid using temp
register when moving X/Y to Y/X.
(m68hc11_gen_movqi): Likewise.
(m68hc11_check_z_replacement): Fix last insn setting for compare case.
From-SVN: r64447
