HOT RELOAD: Support reloading deferred libraries

[johnmccutchan]

We need to handle deferred libraries specially during reload. Currently all deferred library tests are marked skip in the status files.

[turnidge]

I submitted a change to explicitly disallow deferred libraries when reloading, so at least the system will handle it more gracefully until we fix this.

77b9939

There was one odd test that I still saw passing (spuriously) despite the change:

deferred_super_dependency_test: Pass, Crash # Requires deferred libraries

Probably could bear some investigation.

[mraleph]

Closing as outdated.