Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/genericSignature/defaultImplsGenericSignature.kt

@@ -0,0 +1,44 @@
+// FILE: J.java
+
+public class J {
+
+    public static int test1() {
+        A<String, B<String>> x = new X<String, B<String>>("O", new B<String>("K"));
+        return A.DefaultImpls.test1(x, 1, 1.0);
+    }
+
+
+    public static A<String, B<String>> test2(){
+        X<String, B<String>> x = new X<String, B<String>>("O", new B<String>("K"));
+        return A.DefaultImpls.test2(x, 1);
+    }
+}
+
+// FILE: K.kt
+
+class B<T>(val value: T)
+
+interface A<T, Y : B<T>> {
+
+    fun <T, L> test1(p: T, z: L): T {
+        return p
+    }
+
+    fun <L> test2(p: L): A<T, Y> {
+        return this
+    }
+}
+
+
+class X<T, Y : B<T>>(val p1: T, val p2: Y) : A<T, Y> {
+
+}
+
+fun box(): String {
+    val test1 = J.test1()
+    if (test1 != 1) return "fail 1: $test1 != 1"
+
+    val test2: X<String, B<String>> = J.test2() as X<String, B<String>>
+
+    return test2.p1 + test2.p2.value
+}