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

^KT-65979

compiler/testData/codegen/box/classDelegation/multipleModules.kt

@@ -0,0 +1,40 @@
+// WITH_STDLIB
+// MODULE: lib
+// FILE: lib.kt
+
+package zzz
+
+interface I {
+    fun foo(): Int
+}
+
+open class A : I {
+    override fun foo() = 42
+}
+
+open class B : I by A() {
+    val x = 117
+    val y = "zzz"
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+import zzz.*
+import kotlin.test.*
+
+class C : B() {
+    val a = "qxx"
+    val b = 123
+}
+
+fun box(): String {
+    val c = C()
+    assertEquals("qxx", c.a)
+    assertEquals(123, c.b)
+    assertEquals(42, c.foo())
+    assertEquals(117, c.x)
+    assertEquals("zzz", c.y)
+
+    return "OK"
+}