Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/mapping/fakeOverrides/javaMethod.kt

@@ -0,0 +1,17 @@
+// WITH_REFLECT
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.*
+
+open class TestBase {
+    fun id() = 0L
+}
+
+class TestChild : TestBase()
+
+fun box(): String {
+    if (TestChild::class.memberFunctions.first { it.name == "id" }.javaMethod == null)
+        return "No method for TestChild.id()"
+
+    return "OK"
+}