Merge boxWithJava testData into box, delete BoxWithJava test

compiler/testData/codegen/box/secondaryConstructors/withGenerics.kt

@@ -0,0 +1,37 @@
+// TARGET_BACKEND: JVM
+// FILE: WithGenerics.java
+
+class WithGenerics {
+    public static String foo1() {
+        A<Double> x = new A<Double>("OK");
+        return x.toString();
+    }
+
+    public static String foo2() {
+        A<Integer> x = new A<Integer>(123);
+        return x.toString();
+    }
+}
+
+// FILE: WithGenerics.kt
+
+open class A<T> {
+    val prop: String
+    constructor(x: String) {
+        prop = x
+    }
+    constructor(x: T) {
+        prop = x.toString()
+    }
+
+    override fun toString() = prop
+}
+
+fun box(): String {
+    val a1 = WithGenerics.foo1()
+    if (a1 != "OK") return "fail1: $a1"
+    val a2 = WithGenerics.foo2()
+    if (a2 != "123") return "fail2: $a2"
+
+    return "OK"
+}