emit-rtl.c (set_mem_attributes_minus_bitpos): Explicitly derive default values from MEM mode if no memory attributes are present.

	* emit-rtl.c (set_mem_attributes_minus_bitpos): Explicitly derive
	default values from MEM mode if no memory attributes are present.
	Do not use mode alignment, even on STRICT_ALIGNMENT targets, when
	called with an expression (not a type).

From-SVN: r168344