This is needed for further commit, which supports contracts-based
smartcasts in partial body resolve mode.
NB: Stubs can be built from 3 sources:
- source code (contract presence can be checked by PSI)
- binary data (contract presence can be checked by Kotlin Metadata)
- decompiled sources
The last case is a bit of a headache, because usually bodies are omitted
in decompiled sources. To workaround it, we have to inject stubbed
contract-call in the body.
Dmitry Savvinov
5ab79a111d