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/MapTest/createFrom.kt

@@ -0,0 +1,19 @@
+import kotlin.test.*
+
+
+fun box() {
+    val pairs = arrayOf("a" to 1, "b" to 2)
+    val expected = mapOf(*pairs)
+
+    assertEquals(expected, pairs.toMap())
+    assertEquals(expected, pairs.asIterable().toMap())
+    assertEquals(expected, pairs.asSequence().toMap())
+    assertEquals(expected, expected.toMap())
+    assertEquals(mapOf("a" to 1), expected.filterKeys { it == "a" }.toMap())
+    assertEquals(emptyMap(), expected.filter { false }.toMap())
+
+    val mutableMap = expected.toMutableMap()
+    assertEquals(expected, mutableMap)
+    mutableMap += "c" to 3
+    assertNotEquals(expected, mutableMap)
+}