backend: enable some tests

backend.native/tests/build.gradle

@@ -195,7 +195,6 @@ task null_check(type: RunKonanTest) {
 }
 
 task array_to_any(type: RunKonanTest) {
-    disabled = true
     source = "codegen/basics/array_to_any.kt"
 }
 
@@ -386,7 +385,6 @@ task statements0(type: RunKonanTest) {
 }
 
 task boxing0(type: RunKonanTest) {
-    disabled = true
     goldValue = "17\n"
     source = "codegen/boxing/boxing0.kt"
 }

backend.native/tests/codegen/basics/array_to_any.kt

@@ -1,5 +1,5 @@
 fun main(args: Array<String>) {
-    println(foo().toString())
+    foo().hashCode()
 }
 
 fun foo(): Any {

backend.native/tests/runtime/collections/hash_map0.kt

@@ -181,7 +181,6 @@ fun testPutEntry() {
     assertTrue(expected == m)
 }
 
-/* Fails due to variance.
 fun testRemoveAllEntries() {
     val expected = mapOf("a" to "1", "b" to "2", "c" to "3")
     val m = HashMap(expected)
@@ -199,7 +198,7 @@ fun testRetainAllEntries() {
     assertEquals(expected, m)
     assertTrue(m.entries.retainAll(mapOf("b" to "22", "c" to "3", "d" to "4").entries))
     assertEquals(mapOf("c" to "3"), m)
-} */
+}
 
 fun testContainsAllValues() {
     val m = HashMap(mapOf("a" to "1", "b" to "2", "c" to "3"))
@@ -256,8 +255,8 @@ fun main(args : Array<String>) {
     testHashCode()
     testToString()
     testPutEntry()
-    //testRemoveAllEntries()
+    testRemoveAllEntries()
-    //testRetainAllEntries()
+    testRetainAllEntries()
     testContainsAllValues()
     testRemoveValue()
     testRemoveAllValues()