Fix generated assembly to be collectible

[m08pvv]

Fixed issue #473

[jonorossi]

Sorry for the delay in reviewing this.

I expected the unit tests to have failed with the Restrictions on collectible assemblies saying these assemblies are "transient (that is, it cannot be saved)". I assume that the unit tests are following the previous branch which uses RunAndSave and so this has no unit tests.

With the number of restrictions on collectable dynamic assemblies I think this will probably need to be an opt-in selection. I can't quite understand the details but there sounds like a big gotchas where non-collectable assemblies can't reference collectable assemblies.

Could you please share some details about the testing you've done. Thanks.

[jonorossi]

Closing as stale.