public void forEachPhiInsn(PhiInsn.Visitor v) {
    int sz = insns.size();

    for (int i = 0; i < sz; i++) {
      SsaInsn insn = insns.get(i);
      if (insn instanceof PhiInsn) {
        v.visitPhiInsn((PhiInsn) insn);
      } else {
        /*
         * Presently we assume PhiInsn's are in a continuous
         * block at the top of the list
         */
        break;
      }
    }
  }
Visits each phi insn.

@param v {@code non-null;} the callback
android/android_framework/dex-maker/src/main/java/com/android/dx/ssa/SsaBasicBlock.java