backend/tests: Add blackbox tests from Kotlin JVM

Added tests from testData/codegen/box directory. There are blackbox tests
in other directories and they are to be added.

backend.native/tests/external/codegen/blackbox/jvmName/multifileClassWithLocalGeneric.kt

@@ -0,0 +1,22 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+
+@file:JvmName("Test")
+@file:JvmMultifileClass
+package test
+
+fun foo(): String = bar()
+fun bar(): String {
+    open class LocalGeneric<T>(val x: T)
+    class Derived(x: String) : LocalGeneric<String>(x)
+    fun <T> LocalGeneric<T>.extFun() = this
+    fun <T> localFun(x: LocalGeneric<T>) = x
+    class Local3 {
+        fun <T> method(x: LocalGeneric<T>) = x.x
+    }
+    return Local3().method(localFun(Derived("OK")).extFun())
+}
+
+fun box(): String = foo()