md.texi (Blackfin family constraints): Document PA and PB.

md.texi (Blackfin family constraints): Document PA and PB.

	* doc/md.texi (Blackfin family constraints): Document PA and PB.
	* config/bfin/bfin.h (CONST_OK_FOR_P): Handle PA and PB.
	(MACFLAGS_MATCH_P): New macro.
	* config/bfin/bfin.c (print_operand): Handle MACFLAG_IS_M.
	(bfin_secondary_reload): Treat EVEN_AREGS and ODD_AREGS like AREGS.
	* config/bfin/bfin.md (MACFLAG_IS_M): New constant.  Renumber some of
	the other MACFLAG constants.
	(sum_of_accumulators, lshrpdi3, ashrpdi3): New patterns.
	(flag_machi): Tighten constraints.  Renumber some of the operands.
	(flag_machi_acconly): Tighten constraints.  Correct operand numbers in
	output template.
	(flag_machi_parts_acconly): New pattern.
	(flag_macinithi): Tighten constraints.  Allow any accumulator to be
	used.
	(flag_macinit1hi): Tighten constraints.
	(flag_mul_macv2hi_parts_acconly): New pattern.

From-SVN: r123745