IR expects overridden symbols of "invoke" in KFunction to be "invoke"
in the corresponding Function classes.
Before this commit we don't set overriddenSymbol, now we do.
This patch mutes the following test categories:
* Tests with java dependencies (System class,
java stdlib, jvm-oriented annotations etc).
* Coroutines tests.
* Reflection tests.
* Tests with an inheritance from the standard
collections.