Minor: split test to access to companion and to nested object

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

@@ -0,0 +1,19 @@
+// TODO enable for JS backend too when KT-6203 will be fixed
+// TARGET_BACKEND: JVM
+
+class A(val result: Int) {
+    object B {
+        fun bar(): Int = 4
+        val prop = 5
+    }
+    object C {
+    }
+
+    constructor() : this(B.bar() + B.prop)
+}
+
+fun box(): String {
+    val result = A().result
+    if (result != 9) return "fail: $result"
+    return "OK"
+}