reload1.c (alter_reg): Require the alignment of the stack slot to be at least reg_max_ref_width bytes.

gcc/
	* reload1.c (alter_reg): Require the alignment of the stack slot to
	be at least reg_max_ref_width bytes.
	(scan_paradoxical_subregs): Record the largest width in
	reg_max_ref_width.

From-SVN: r117252