re PR tree-optimization/58296 (ivopts is unable to handle some loops altered by the...

re PR tree-optimization/58296 (ivopts is unable to handle some loops altered by the loop header copying pass)

	PR tree-optimization/58296
	PR tree-optimization/41488
	* tree-scalar-evolution.c: Include necessary header files.
	(simplify_peeled_chrec): New function.
	(analyze_evolution_in_loop): New static variable.
	Call simplify_peeled_chrec.
	* tree-ssa-loop-ivopts.c (mark_bivs): Don't mark peeled IV as biv.
	(add_old_iv_candidates): Don't add candidate for peeled IV.
	* tree-affine.h (aff_combination_zero_p): New function.

	PR tree-optimization/58296
	PR tree-optimization/41488
	* gcc.dg/tree-ssa/scev-7.c: New test.
	* gcc.dg/pr41488.c: New test.
	* g++.dg/pr59445.C: New test.

From-SVN: r205959