Light classes: do not rely on dummy context when data class autogenerated members conflict with declared members

Fix related issues with nested classes

compiler/testData/asJava/lightClasses/DelegatedNested.kt

@@ -0,0 +1,15 @@
+// p.B
+package p
+
+class B {
+    class A(private val f: I) : I by f {
+    }
+}
+
+interface I {
+    fun g()
+
+    fun f()
+}
+
+// LAZINESS:NoLaziness