public void addPhiInsnForReg(RegisterSpec resultSpec){
  insns.add(0,new PhiInsn(resultSpec,this));
}

public void addPhiInsnForReg ( RegisterSpec resultSpec ) { insns . add ( 0 , new PhiInsn ( resultSpec , this ) ) ; }
adds a phi insn to the beginning of this block . this is to be used when the result type or local - association can be determined at phi insert time .
