- Remove obsolete exclusion of core & stdlib modules, since they are now
compiled with JVM target 1.8, but leave `:core:descriptors` because of
an issue in Proguard.
- Remove binary-compatibility-validator and update test data instead.
- Replace some "contains" checks with equality for clarity.
- Remove modules from -Werror filter which no longer use the deprecated
compatibility mode.
Compiler supposed to generate such method inside the
LocalFileKotlinClass class, but because of the KT-18489 method
getContainingLibrary is not generated. Because of that we potentially
could get AbstractMethodError. In order to fix that we are adding
explicit ovverride in java super class