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

^KT-65979

compiler/testData/codegen/box/lateinit/isInitialized.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+// JVM_ABI_K1_K2_DIFF: KT-63864
+// WITH_STDLIB
+
+import kotlin.test.*
+
+val sb = StringBuilder()
+
+class A {
+    lateinit var s: String
+
+    fun foo() {
+        sb.appendLine(::s.isInitialized)
+    }
+}
+
+fun box(): String {
+    val a = A()
+    a.foo()
+    a.s = "zzz"
+    a.foo()
+
+    assertEquals("""
+        false
+        true
+
+    """.trimIndent(), sb.toString())
+    return "OK"
+}