void st_build_dominator_tree (ir_graph*);
bool dominates (ir_graph*, ir_node*, ir_node*);
ir_node *get_idom (ir_graph*, ir_node*);
void st_build_dominator_tree (ir_graph*);
bool dominates (ir_graph*, ir_node*, ir_node*);
ir_node *get_idom (ir_graph*, ir_node*);