constraints.md: New file.

constraints.md: New file.

	* config/bfin/constraints.md: New file.
	* config/bfin/bfin.md: Include it.
	(adddi3): Use satisfies_constraint functions instead of the old macros.
	* config/bfin/bfin.h (REG_CLASS_FROM_LETTER, CONSTRAINT_LEN,
	CONST_18UBIT_IMM_P, CONST_16BIT_IMM_P, CONST_16UBIT_IMM_P,
	CONST_7BIT_IMM_P, CONST_7NBIT_IMM_P, CONST_5UBIT_IMM_P,
	CONST_4BIT_IMM_P, CONST_4UBIT_IMM_P, CONST_3BIT_IMM_P,
	CONST_3UBIT_IMM_P, CONST_OK_FOR_K, CONST_OK_FOR_P, CONST_OK_FOR_M,
	CONST_OK_FOR_CONSTRAINT_P, CONST_DOUBLE_OK_FOR_LETTER,
	EXTRA_CONSTRAINT): Delete.
	* config/bfin/predicates.md (highbits_operand, reg_or_7bit_operand,
	reg_or_neg7bit_operand): Use satisfies_constraint functions instead
	of the old macros.
	* config/bfin/bfin.c: Include "tm-constrs.h".
	(bfin_secondary_reload, split_load_immediate, bfin_rtx_costs):
	Use satisfies_constraint functions instead of the old macros.
	* doc/md.texi (Blackfin Constraints): Update file name reference.

From-SVN: r134198