code: @Override
      public void visitCode(Code obj) {
          stack.resetForMethodEntry(this);
          changedAttributes.clear();
          savedAttributes.clear();
          super.visitCode(obj);
          for (Integer pc : changedAttributes.values()) {
              bugReporter.reportBug(new BugInstance(this, BugType.SCSS_SUSPICIOUS_CLUSTERED_SESSION_SUPPORT.name(), NORMAL_PRIORITY).addClass(this)
                      .addMethod(this).addSourceLine(this, pc.intValue()));
          }
      }
docs: implements the visitor to report on attributes that have changed, without a setAttribute being called on them
  
  @param obj
  the currently parsed method