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/DataClassWithCustomImplementedMembers.kt

@@ -0,0 +1,20 @@
+// p.Wrapper
+package p
+
+class Wrapper {
+    data class Equals(val code: G) {
+        override fun equals(other: Any?): Boolean = true
+    }
+
+    data class HashCode(val code: G) {
+        override fun hashCode() = 3
+    }
+
+    data class ToString(val code: G) {
+        override fun toString() = "b"
+    }
+}
+
+class G
+
+// LAZINESS:NoLaziness