KT-11960 Fix for data classes

compiler/testData/codegen/box/secondaryConstructors/localDataClass.kt

@@ -0,0 +1,20 @@
+// Enable for JVM backend when KT-8120 gets fixed
+// TARGET_BACKEND: JS
+
+fun box(): String {
+    val capturedInConstructor = 1
+
+    data class A(var x: Int) {
+        var y = 0
+
+        init {
+            y += x + capturedInConstructor
+        }
+    }
+
+    val a = A(100).copy()
+    if (a.y != 101) return "fail1a: ${a.y}"
+    if (a.x != 100) return "fail1b: ${a.x}"
+
+    return "OK"
+}