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PR tree-optimization/18463 * tree-chrec.c (chrec_convert): Return fold_converted chrec if converting it directly is not possible. (chrec_convert_aggressive): New function. * tree-chrec.h (chrec_convert_aggressive): Declare. * tree-scalar-evolution.c (instantiate_parameters_1, resolve_mixers): Fold chrec conversions aggressively if asked to. (instantiate_parameters): Modified because of changes in instantiate_parameters_1. From-SVN: r104443
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