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

^KT-65979

compiler/testData/codegen/box/initializers/multipleModules1.kt

@@ -0,0 +1,17 @@
+// WITH_STDLIB
+// MODULE: lib
+// FILE: lib.kt
+
+val a = 10
+val b = a * 6
+val c = a * b * 2
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+import kotlin.test.*
+
+fun box(): String {
+    assertEquals(1200, c)
+    return "OK"
+}