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/utils/KotlinVersionTest/componentValidation.kt

@@ -0,0 +1,17 @@
+import kotlin.test.*
+
+
+fun box() {
+    for (component in listOf(Int.MIN_VALUE, -1, 0, KotlinVersion.MAX_COMPONENT_VALUE, KotlinVersion.MAX_COMPONENT_VALUE + 1, Int.MAX_VALUE)) {
+        for (place in 0..2) {
+            val (major, minor, patch) = IntArray(3) { index -> if (index == place) component else 0 }
+            if (component in 0..KotlinVersion.MAX_COMPONENT_VALUE) {
+                KotlinVersion(major, minor, patch)
+            } else {
+                assertFailsWith<IllegalArgumentException>("Expected $major.$minor.$patch to be invalid version") {
+                    KotlinVersion(major, minor, patch)
+                }
+            }
+        }
+    }
+}

backend.native/tests/external/stdlib/utils/KotlinVersionTest/currentVersion.kt

@@ -0,0 +1,14 @@
+import kotlin.test.*
+
+
+fun box() {
+    assertTrue(KotlinVersion.CURRENT.isAtLeast(1, 1))
+    assertTrue(KotlinVersion.CURRENT.isAtLeast(1, 1, 0))
+    assertTrue(KotlinVersion.CURRENT >= KotlinVersion(1, 1))
+    assertTrue(KotlinVersion(1, 1) <= KotlinVersion.CURRENT)
+
+    val anotherCurrent = KotlinVersion.CURRENT.run { KotlinVersion(major, minor, patch) }
+    assertEquals(KotlinVersion.CURRENT, anotherCurrent)
+    assertEquals(KotlinVersion.CURRENT.hashCode(), anotherCurrent.hashCode())
+    assertEquals(0, KotlinVersion.CURRENT.compareTo(anotherCurrent))
+}