The C# compiler uses it. You couldn't get a better example, I think. Download SSCLI20 and look in the csharp/sccomp subdirectory. You'll find the compiler.cpp source code file creating the instance of the interface and storing it in the linker
variable. Now searching for "linker" gets you all the places where the interface methods are used.
Of course do keep in mind that it wasn't made to change an existing assembly. It was made to create a new assembly from scratch. Corflags.exe doesn't use it.