// ReturnInst(Value* X, Inst *I) - 'ret X' instruction, insert before I
// ReturnInst( null, BB *B) - 'ret void' instruction, insert @ end of BB
// ReturnInst(Value* X, BB *B) - 'ret X' instruction, insert @ end of BB
+ // ReturnInst(Value* X, N) - 'ret X,X+1...X+N-1' instruction
+ // ReturnInst(Value* X, N, Inst *) - 'ret X,X+1...X+N-1', insert before I
+ // ReturnInst(Value* X, N, BB *) - 'ret X,X+1...X+N-1', insert @ end of BB
//
// NOTE: If the Value* passed is of type void then the constructor behaves as
// if it was passed NULL.