docs: public void addVariableDescriptor(String name, String type, int startPC, int register) {
          int nameIndex = itsConstantPool.addUtf8(name);
          int descriptorIndex = itsConstantPool.addUtf8(type);
          int[] chunk = {nameIndex, descriptorIndex, startPC, register};
          if (itsVarDescriptors == null) {
              itsVarDescriptors = new ObjArray();
          }
          itsVarDescriptors.add(chunk);
      }