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

^KT-65979

compiler/testData/codegen/box/inlineClass/defaultEquals.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2020 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.
+ */
+// WITH_STDLIB
+
+import kotlin.test.*
+
+inline class A(val x: Int)
+inline class B(val a: A)
+inline class C(val s: String)
+inline class D(val c: C)
+
+fun box(): String {
+    val a = A(42)
+    val b = B(a)
+    val c = C("zzz")
+    val d = D(c)
+    assertTrue(a.equals(a))
+    assertTrue(b.equals(b))
+    assertTrue(c.equals(c))
+    assertTrue(d.equals(d))
+
+    return "OK"
+}