public void forEachInsn(SsaInsn.Visitor visitor) {
    // This gets called a LOT, and not using an iterator
    // saves a lot of allocations and reduces memory usage
    int len = insns.size();
    for (int i = 0; i < len; i++) {
      insns.get(i).accept(visitor);
    }
  }
Visits all insns in this block.

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