Added tests on bridges

backend.native/tests/codegen/bridges/test14.kt

@@ -0,0 +1,44 @@
+open class A<T, U> {
+    open fun foo(x: T, y: U) {
+        println(x.toString())
+        println(y.toString())
+    }
+}
+
+interface I1<T> {
+    fun foo(x: Int, y: T)
+}
+
+interface I2<T> {
+    fun foo(x: T, y: Int)
+}
+
+class B : A<Int, Int>(), I1<Int>, I2<Int> {
+    var z: Int = 5
+    var q: Int = 7
+    override fun foo(x: Int, y: Int) {
+        z = x
+        q = y
+    }
+}
+
+fun zzz(a: A<Int, Int>) {
+    a.foo(42, 56)
+}
+
+fun main(args: Array<String>) {
+    val b = B()
+    zzz(b)
+    val a = A<Int, Int>()
+    zzz(a)
+    println(b.z)
+    println(b.q)
+    val i1: I1<Int> = b
+    i1.foo(56, 42)
+    println(b.z)
+    println(b.q)
+    val i2: I2<Int> = b
+    i2.foo(156, 142)
+    println(b.z)
+    println(b.q)
+}