Fixed bug in vTable building + test

backend.native/tests/build.gradle

@@ -958,6 +958,12 @@ task bridges_linkTest(type: LinkKonanTest) {
     lib = "codegen/bridges/linkTest_lib.kt"
 }
 
+task bridges_linkTest2(type: LinkKonanTest) {
+    goldValue = "true\n"
+    source = "codegen/bridges/linkTest2_main.kt"
+    lib = "codegen/bridges/linkTest2_lib.kt"
+}
+
 task bridges_special(type: RunKonanTest) {
     goldValue = "Ok\n"
     source = "codegen/bridges/special.kt"

backend.native/tests/codegen/bridges/linkTest2_lib.kt

@@ -0,0 +1,15 @@
+sealed class Tag {
+    abstract fun value(): Any
+}
+
+sealed class TagBoolean : Tag() {
+    abstract override fun value(): Boolean
+
+    object True : TagBoolean() {
+        override fun value() = true
+    }
+
+    object False : TagBoolean() {
+        override fun value() = false
+    }
+}

backend.native/tests/codegen/bridges/linkTest2_main.kt

@@ -0,0 +1,4 @@
+fun main(args: Array<String>) {
+    val test: TagBoolean = TagBoolean.True
+    println(test.value())
+}