Merge pull request #6309 from victor-homyakov/patch-1

Free memory allocated by testElement after usage

Author: zpao

src/renderers/dom/client/utils/setInnerHTML.js

@@ -79,6 +79,7 @@ if (ExecutionEnvironment.canUseDOM) {
  }
  };
  }
+ testElement = null;
 }
 
 module.exports = setInnerHTML;