Convert SPARC backend over to LRA.

Convert SPARC backend over to LRA.

gcc/

	* config/sparc/constraints.md: Make "U" constraint a real register
	constraint.
	* config/sparc/sparc.c (TARGET_LRA_P): Define.
	(D_MODES, DF_MODES): Add missing cast.
	(TF_MODES, TF_MODES_NO_S): Include T_MODE.
	(OF_MODES, OF_MODES_NO_S): Include O_MODE.
	(sparc_register_move_cost): Decrease Niagara/UltrsSPARC memory
	cost to 8.
	* config/sparc/sparc.h (PROMOTE_MODE): Define.
	* config/sparc/sparc.md (*movsi_lo_sum, *movsi_high): Do not
	provide these insn when flag_pic.

From-SVN: r227701