question: public void addInsnToHead ( Insn insn ) { SsaInsn newInsn = SsaInsn . makeFromRop ( insn , this ) ; insns . add ( getCountPhiInsns ( ) , newInsn ) ; parent . onInsnAdded ( newInsn ) ; }
target:  Adds an insn to the head of this basic block, just after any phi insns.