* calls.c (PUSH_ARGS_REVERSED) Change to expression.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): Provide default value.
	(struct arg_data): Remove #ifdef ACCUMULATE_OUTGOING_ARGS.
	(save_fixed_argument_area, restore_fixed_argument_area):
	conditionize by #ifdef REG_PARM_STACK_SPACE only.
	(emit_call): Change #ifdefs on ACCUMULATE_OUTGOING_ARGS
	to conditions, handle RETURN_POPS_ARGS on ACCUMULATE_OUTGOING_ARGS.
	(precompute_register_parameters): Avoid #ifdefs on
	ACCUMULATE_OUTGOING_ARGS and PUSH_ARGS_REVERSED.
	(stire_one_args): Likewise.
	(expand_call): Likewise; conditionize PUSH_ROUNDING code by PUSH_ARGS.
	(emit_library_call_value_1): Likewise.
	(compute_argument_block_size): Align to STACK_BOUNDARY only for
	ACCUMULATE_OUTGOING_ARGS.
	* combine.c (ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): Provide default
	value.
	(nonzero_bits): Conditionize PUSH_ROUNDING code by USE_PUSH.
	(use_crosses_set_p): Likewise.
	* all targets (ACCUMULATE_OUTGOING_ARGS define): Change to
	#define ACCUMULATE_OUTGOING_ARGS 1.
	* i386.c (ix86_compute_frame_size): Handle ACCUMULATE_OUTGOING_ARGS
	frames.
	* i386.h (MASK_NO_PUSH_ARGS, MASK_ACCUMULATE_OUTGOING_ARGS): New
	constants.
	(TARGET_PUSH_ARGS, TARGET_ACCUMULATE_OUTGOING_ARGS): New macros.
	(TARGET_SWITCHES): Add push-args, no-push-args,
	accumulate-outgoing-args and no-accumulate-outgoing-args.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ARGS): New macro.
	* expr.c (ACCUMULATE_OUTGONG_ARGS, PUSH_ARGS): Provide default.
	(push_block): Avoid ifdefs on ACCUMULATE_OUTGONG_ARGS
	and PUSH_ROUNDING.
	(emit_push_insn): Likewise.
	* final.c (ACCUMULATE_OUTGOING_ARGS): Provide default.
	(final_scan_insn): Avoid ifdefs on ACCUMULATE_OUTGOING_ARGS.
	* function.c (ACCUMULATE_OUTGOING_ARGS): Provide default.
	(STACK_DYNAMIC_OFFSET): Define correctly for both
	ACCUMULATE_OUTGOING_ARGS and normal mode.
	* invoke.texi (-mpush_args, -maccumulate-outgoing-args): Document.
	* tm.texi (PUSH_ARGS): Document.
	(ACCUMULATE_OUTGOING_ARGS, PUSH_ROUNDING): Update documentation.

From-SVN: r32803