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/ranges/RangeTest/isEmpty.kt

@@ -0,0 +1,21 @@
+import kotlin.test.*
+
+
+fun box() {
+    assertTrue((2..1).isEmpty())
+    assertTrue((2L..0L).isEmpty())
+    assertTrue((1.toShort()..-1.toShort()).isEmpty())
+    assertTrue((0.toByte()..-1.toByte()).isEmpty())
+    assertTrue((0f..-3.14f).isEmpty())
+    assertTrue((-2.72..-3.14).isEmpty())
+    assertTrue(('z'..'x').isEmpty())
+
+    assertTrue((1 downTo 2).isEmpty())
+    assertTrue((0L downTo 2L).isEmpty())
+    assertFalse((2 downTo 1).isEmpty())
+    assertFalse((2L downTo 0L).isEmpty())
+    assertTrue(('a' downTo 'z').isEmpty())
+    assertTrue(('z'..'a' step 2).isEmpty())
+
+    assertTrue(("range".."progression").isEmpty())
+}