Member predicate RangeSsa :: custom_phi_node

Add a phi node on the out-edge of a guard.

                            
                                
                                    predicate
                                
                                 
                            
                            
                                custom_phi_node
                            
                            
                                (
                                
                                    
                                        StackVariable
                                    
                                     
                                    v
                                
                                , 
                                
                                    
                                        BasicBlock
                                    
                                     
                                    b
                                
                                )