[FIR] Don't build redundant fake overrides for private members

The only case we may need fake override for private members is
a situation when class refers itself with different type arguments.
So in this commit we forbid such fake overrides when we can prove
that class does not refers itself here.

compiler/testData/codegen/box/classes/kt1134.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TODO: Enable when JS backend supports Java class library
 // TARGET_BACKEND: JVM
 public class SomeClass() : java.lang.Object() {