emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGINGP_P if T is a constant expression.

emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGINGP_P if T is a constant expression.

	* emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGINGP_P if T is a
	constant expression.
	(set_mem_decl): New function.
	* expr.h (set_mem_decl): New declaration.
	* final.c (get_decl_from_op): Don't use ORIGINAL_REGNO if not pseudo.
	(output_asm_operand_names): Add tab.
	* reload1.c (alter_reg): Set decl of MEM from REG_DECL.

From-SVN: r46733