After splitting the facades into multiple modules,
enabling prod mode for code had no effect for the compiler.
Also in a change between RC1 and RC2 we created the `CompilerConfig`
via a provider with `useValue` and not via a `useFactory`, which reads
the prod mode too early.
Closes#9318Closes#8508Closes#9318
Refactored ReflectorHost to allow it to be tested.
Fixed an issue where the .d.ts was findable but it wasn't used by the project
(This happens when the .metadata.json file references a module that was not
needed, such as it doesn't declare any types, and the reference to it was
elided by TypeScript when writing the .d.ts file).
Added tests for ReflectorHost