* i386.c (x86_accumulate_outgoing_args, x86_prologue_using_move,
	x86_epilogue_using_move): New global variables.
	(override_options): Enable ACCUMULATE_OUTGOING_ARGS if preferred.
	(ix86_emit_save_regs_using_mov): New static function.
	(ix86_expand_prologue, ix86_expand_epilogue): Use moves if preferred.
	* i386.h (MASK_MMX, MASK_SSE, MASK_SSE2, MASK_128BIT_LONG_DOUBLE,
	MASK_MIX_SSE_I387): Renumber.
	(MASK_NO_ACCUMULATE_OUTGOING_ARGS): New.
	(x86_accumulate_outgoing_args, x86_prologue_using_move,
	x86_epilogue_using_move): Declare.
	(TARGET_PROLOGUE_USING_MOVE, TARGET_EPILOGUE_USING_MOVE): New.

From-SVN: r43366