backend/tests: add objectInitialization1

backend.native/tests/codegen/object/initialization1.kt

@@ -0,0 +1,20 @@
+class Test {
+    constructor() {
+        println("constructor1")
+    }
+
+    constructor(x: Int) : this() {
+        println("constructor2")
+    }
+
+    init {
+        println("init")
+    }
+
+    val f = println("field")
+}
+
+fun main(args: Array<String>) {
+    Test()
+    Test(1)
+}