[Patch 1/7] Hookize *_BY_PIECES_P

[Patch 1/7] Hookize *_BY_PIECES_P

gcc/

	* target.def (use_by_pieces_infrastructure_p): New.
	* doc/tm.texi.in (MOVE_BY_PIECES_P): Describe that this macro
	is deprecated.
	(STORE_BY_PIECES_P): Likewise.
	(CLEAR_BY_PIECES_P): Likewise.
	(SET_BY_PIECES_P): Likewise.
	(TARGET_MOVE_BY_PIECES_PROFITABLE_P): Add hook.
	* doc/tm.texi: Regenerate.
	* expr.c (MOVE_BY_PIECES_P): Rewrite in terms of
	TARGET_USE_BY_PIECES_INFRASTRUCTURE_P.
	(STORE_BY_PIECES_P): Likewise.
	(CLEAR_BY_PIECES_P): Likewise.
	(SET_BY_PIECES_P): Likewise.
	(STORE_MAX_PIECES): Move to...
	* defaults.h (STORE_MAX_PIECES): ...here.
	* targhooks.c (get_move_ratio): New.
	(default_use_by_pieces_infrastructure_p): Likewise.
	* targhooks.h (default_use_by_pieces_infrastructure_p): New.
	* target.h (by_pieces_operation): New.

From-SVN: r216996