TEST: throw keyword support.

backend.native/tests/runtime/basic/throw0.kt

@@ -0,0 +1,8 @@
+fun main(args : Array<String>) {
+    val cond = 1
+    if (cond == 2) throw RuntimeException()
+    if (cond == 3) throw NoSuchElementException("no such element")
+    if (cond == 4) throw Error("error happens")
+
+    println("Done")
+}