public void set(int n, DalvInsn insn) {
    set0(n, insn);
  }
Sets the instruction at the given index.

@param n {@code >= 0, < size();} which index
@param insn {@code non-null;} the instruction to set at {@code n}
android/android_framework/dex-maker/src/main/java/com/android/dx/dex/code/DalvInsnList.java