re PR tree-optimization/45605 (Missed devirtualization)
PR tree-optimization/45605
* cgraphunit.c (cgraph_analyze_functions): Allocate bitmap obstack.
* gimple-fold.c (static_object_in_other_unit_p): New function.
(canonicalize_constructor_val): Use it.
(get_symbol_constant_value): Be reaqdy for canonicalize_constructor_val
returning NULL.
(gimple_fold_obj_type_ref_known_binfo): Use static_object_in_other_unit_p.