tests: Copy stdlib tests from Kotlin/JVM

This patch copies Kotlin/JVM stdlib tests (libraries/stdlib/test)
excepting ones with explicit java dependencies. It also transforms
the tests to use them as box-tests.

backend.native/tests/external/stdlib/collections/CollectionTest/reduce.kt

@@ -0,0 +1,13 @@
+import kotlin.test.*
+import kotlin.comparisons.*
+
+fun box() {
+    expect("1234") {
+        val list = listOf("1", "2", "3", "4")
+        list.reduce { a, b -> a + b }
+    }
+
+    assertFailsWith<UnsupportedOperationException> {
+        arrayListOf<Int>().reduce { a, b -> a + b }
+    }
+}