mips.h (FRAME_GROWS_DOWNWARD, [...]): Define new macros.

mips.h (FRAME_GROWS_DOWNWARD, [...]): Define new macros.

	* config/mips/mips.h (FRAME_GROWS_DOWNWARD,
	MIPS_GP_SAVE_AREA_SIZE): Define new macros.
	(STARTING_FRAME_OFFSET): Return 0 if FRAME_GROWS_DOWNWARD.  Use
	MIPS_GP_SAVE_AREA_SIZE.
	* config/mips/mips.c (struct mips_frame_info): Update comment
	before arg_pointer_offset and hard_frame_pointer_offset.
	(mips_compute_frame_info): Update diagram before function: to
	correctly use stack_pointer_rtx for fp_sp_offset and gp_sp_offset, to
	indicate the position of frame_pointer_rtx with -fstack-protector and
	to show args_size.  Don't allocate cprestore area for leaf functions
	if FRAME_GROWS_DOWNWARD.  Use MIPS_GP_SAVE_AREA_SIZE to set
	cprestore_size.
	(mips_initial_elimination_offset): Update for FRAME_GROWS_DOWNWARD.

From-SVN: r147024