[Tests] Migrate backend-independent tests from native to compiler/testData.

^KT-65979

compiler/testData/codegen/box/initializers/object.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+// WITH_STDLIB
+
+// FILE: lib.kt
+var z = false
+
+// FILE: lib2.kt
+val x = foo()
+
+fun foo(): Int {
+    z = true
+    return 42
+}
+
+object Z {
+    fun bar() { }
+    fun baz() = x
+}
+
+// FILE: main.kt
+import kotlin.test.*
+
+fun box(): String {
+    Z.bar()
+    assertFalse(z)
+    assertEquals(42, Z.baz())
+    assertTrue(z)
+
+    return "OK"
+}