Erasure: produce raw types, not unbound types

This affects the trap labels for methods, and therefore consistency with the Java extractor.

TODO: check whether we can unify `erase` and `toRawType` entirely.

java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt

@@ -320,7 +320,7 @@ open class KotlinFileExtractor(
         }
     }
 
-    // `typeArgs` can be null to describe a raw generic type.
+    // `argsIncludingOuterClasses` can be null to describe a raw generic type.
     // For non-generic types it will be zero-length list.
     fun extractMemberPrototypes(c: IrClass, argsIncludingOuterClasses: List<IrTypeArgument>?, id: Label<out DbClassorinterface>) {
         with("member prototypes", c) {