PR rtl-optimization/53176
	* rtlanal.c (rtx_cost): Adjust default cost for X with a
	UNITS_PER_WORD factor for all X according to the size of
	its mode, not just for SUBREGs with untieable modes.
	Handle SET.  Use factor * factor for MULT, DIV, UDIV,
	MOD, UMOD.

From-SVN: r189441