i386.md (preferred_for_size): New attribute

i386.md (preferred_for_size): New attribute

	* config/i386/i386.md (preferred_for_size): New attribute
	(*pushxf): Split Yx*r constraints to r,*r.  Use preferred_for_size
	attribute to conditionally disable alternative 1.
	(*pushdf): Split Yd*r constraints to r,*r.  Use preferred_for_size
	and prefered_for_speed attributes to conditionally disable
	alternative 1.
	(*movxf_internal): Split Yx*r constraints to r,*r.  Use
	preferred_for_size attribute to conditionally disable
	alternatives 3 and 4.
	(*movdf_internal): Split Yd*r constraints to r,*r.  Use
	preferred_for_size and prefered_for_speed attributes to conditionally
	disable alternatives 3 and 4.
	* config/i386/constraints.md (Yd, Yx): Remove register constraints.

From-SVN: r218134