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/reflection/noReflectAtRuntime/methodsFromAny/callableReferences.kt

@@ -0,0 +1,34 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+
+import kotlin.reflect.KCallable
+import kotlin.test.*
+
+class M {
+    fun foo() {}
+    val bar = 1
+}
+
+fun checkEquals(x: KCallable<*>, y: KCallable<*>) {
+    assertEquals(x, y)
+    assertEquals(y, x)
+    assertEquals(x.hashCode(), y.hashCode())
+}
+
+fun checkToString(x: KCallable<*>, expected: String) {
+    assertEquals(expected + " (Kotlin reflection is not available)", x.toString())
+}
+
+fun box(): String {
+    checkEquals(M::foo, M::foo)
+    checkEquals(M::bar, M::bar)
+    checkEquals(::M, ::M)
+
+    checkToString(M::foo, "function foo")
+    checkToString(M::bar, "property bar")
+    checkToString(::M, "constructor")
+
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/reflection/noReflectAtRuntime/methodsFromAny/classReference.kt

@@ -0,0 +1,27 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_RUNTIME
+
+import kotlin.reflect.KClass
+import kotlin.test.*
+
+class M
+
+fun check(x: KClass<*>) {
+    assertEquals(x, x.java.kotlin)
+    assertEquals(x.hashCode(), x.java.kotlin.hashCode())
+    assertEquals(x.java.toString() + " (Kotlin reflection is not available)", x.toString())
+}
+
+fun box(): String {
+    check(M::class)
+    check(String::class)
+    check(Error::class)
+    check(Int::class)
+    check(java.lang.Integer::class)
+    check(MutableList::class)
+    check(Array<String>::class)
+
+    return "OK"
+}