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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@104443 138bc75d-0d04-0410-961f-82ee72b054a4