Reorganized SAM-related test data.

compiler/testData/codegen/box/samConstructors/nonTrivialRunnable.kt

@@ -0,0 +1,11 @@
+var result = "FAIL"
+
+fun getFun(): () -> Unit {
+    return { result = "OK" }
+}
+
+fun box(): String {
+    val r = Runnable(getFun())
+    r.run()
+    return result
+}