backend/tests: Add blackbox tests from Kotlin JVM

Added tests from testData/codegen/box directory. There are blackbox tests
in other directories and they are to be added.

backend.native/tests/external/codegen/blackbox/destructuringDeclInLambdaParam/stdlibUsages.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+
+fun box(): String {
+    val r1 = listOf("O", "K", "fail").let {
+        (x, y) -> x + y
+    }
+
+
+    if (r1 != "OK") return "fail 1: $r1"
+
+    val r2 = listOf(Pair("O", "K")).map { (x, y) -> x + y }[0]
+
+    if (r2 != "OK") return "fail 2: $r2"
+
+    return "OK"
+}