Fix several bugs in serialization of inner generic classes

- Interner was working incorrectly with parents
- nested classes were serialized in codegen out of any context

 #KT-5660 Fixed

compiler/testData/loadJava/compiledKotlin/nested/membersReferenceOuterTP.kt

@@ -0,0 +1,11 @@
+package test
+
+class MembersReferenceOuterTP<P> {
+    inner class Inner {
+        fun f<Q : P>() {}
+        fun g(p: P): P = null!!
+
+        val v: P = null!!
+        val <Q : P> w: Q = null!!
+    }
+}