revert: re PR tree-optimization/41488 (IVOpts cannot coalesce multiple induction variables)

	Reverted:
	2013-12-10  Bin Cheng  <bin.cheng@arm.com>
	PR tree-optimization/41488
	* tree-ssa-loop-ivopts.c (add_old_iv_candidates): Don't add cand
	for PEELED_CHREC kind IV.
	* tree-scalar-evolution.c: Include necessary header files.
	(peeled_chrec_map, simplify_peeled_chrec): New.
	(analyze_evolution_in_loop): New static variable.
	Call simplify_peeled_chrec.
	(scev_initialize): Initialize peeled_chrec_map.
	(scev_reset, scev_finalize): Reset and release peeled_chrec_map.

	Reverted:
	2013-12-10  Bin Cheng  <bin.cheng@arm.com>
	PR tree-optimization/41488
	* gcc.dg/tree-ssa/scev-7.c: New test.
	* gcc.dg/pr41488.c: New test.

From-SVN: r205880