tree-scalar-evolution (interpret_rhs_expr): generate chrec for array reference and component reference.

2012-03-09  Jiangning Liu  <jiangning.liu@arm.com>                                                        

	* tree-scalar-evolution (interpret_rhs_expr): generate chrec for
	array reference and component reference.
	(analyze_scalar_evolution_for_address_of): New.

2012-03-09  Jiangning Liu  <jiangning.liu@arm.com>                                                        

	* gcc.dg/tree-ssa/scev-3.c: New.
	* gcc.dg/tree-ssa/scev-4.c: New.

From-SVN: r185129