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* gimple.c (gtc_visited, gtc_ob, type_pair_hash, type_pair_eq): Remove. (GIMPLE_TYPE_PAIR_SIZE): New macro. (type_pair_cache): New static var. (lookup_type_pair): Use fixed sized custom hash; make inline. (gtc_visit, gimple_types_compatible_p, gimple_register_type_1): Update calls of lookup_type_pair. (print_gimple_types_stats): Remove cache stats. (free_gimple_type_tables): Free type_pair_cache instead of gtc_visited and gtc_ob. From-SVN: r173925
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