Fix type safe barrier bridges for generics with non-trivial upper bound

kotlin-native/backend.native/tests/codegen/bridges/specialGeneric.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package codegen.bridges.specialGeneric
+
+import kotlin.test.*
+
+interface Element {
+    val isContained: Boolean
+}
+
+object ContainedElement : Element {
+    override val isContained: Boolean = true
+}
+
+object NotContainedElement : Element {
+    override val isContained: Boolean = false
+}
+
+internal class MySet<E : Element> : Set<E> {
+    override fun contains(element: E): Boolean = element.isContained
+
+    override fun equals(other: Any?): Boolean = TODO()
+    override fun hashCode(): Int = TODO()
+    override fun toString(): String = TODO()
+
+    override val size: Int get() = TODO()
+    override fun isEmpty(): Boolean = TODO()
+    override fun containsAll(elements: Collection<E>): Boolean = TODO()
+
+    override fun iterator(): Iterator<E> = TODO()
+}
+
+fun set(): Set<Any> = MySet<Element>()
+
+@Test
+fun testMySet() {
+    val set = set()
+    assertFalse(set.contains(Any()))
+    assertFalse(set.contains(NotContainedElement))
+    assertTrue(set.contains(ContainedElement))
+}