re PR tree-optimization/19224 (Endless loop compiling simple file: Bug in tree-scalar-evolution.c (instantiate_parameters_1)?)

	PR tree-optimization/19224
	* tree-scalar-evolution.c (get_instantiated_value,
	set_instantiated_value): New functions.
	(instantiate_parameters_1): Cache the results.
	(instantiate_parameters, resolve_mixers): Initialize and free
	the cache.

From-SVN: r93106