||# JS Fuzzing Interface
||This function is called once at startup. You can use it to e.g. read
environment variables to initialize additional options you might need.
Note that `gCx` and `gGlobal` are pre-initialized by the harness.
||Create the global object.
||If we succeeded in deserializing, we should try to reserialize the data.
This has two main advantages:
1) It tests parts of the serializer as well.
2) The deserialized data is actually used, making it more likely to detect
further memory-related problems.
Tests show that this also doesn't cause a serious performance penalty.