re PR tree-optimization/59139 (internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267)

2013-12-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/59139
	* tree-ssa-loop-niter.c (chain_of_csts_start): Properly match
	code in get_val_for.
	(get_val_for): Use gcc_checking_asserts.

	* gcc.dg/torture/pr59139.c: New testcase.

From-SVN: r205588