generation of inner classes inside object literal. #KT-2607 fixed

on the way ClassCodegen and MemberCodegen refactored out and injectors regenerated

compiler/testData/codegen/regressions/kt2607.kt

@@ -0,0 +1,9 @@
+fun box() : String {
+    val o = object {
+
+        class C {
+            fun foo() = "OK"
+        }
+    }
+    return o.C().foo()
+}