[JS IR] Use type upper bounds for calculating function signatures

^KT-59239 Fixed

js/js.translator/testData/box/expression/cast/unsafeVarianceCast.kt

@@ -1,5 +1,8 @@
-abstract class Foo<out E> {
+// DONT_TARGET_EXACT_BACKEND: JS
+
+abstract class Foo<out E>: Collection<E> {
     abstract fun foo(element: @UnsafeVariance E): Boolean
+    abstract override fun contains(element: @UnsafeVariance E): Boolean
 }
 
 class Bar<E : C> : Foo<E>() {
@@ -7,15 +10,49 @@ class Bar<E : C> : Foo<E>() {
         if (element !is C?) return false
         return true
     }
+
+    override fun contains(element: E): Boolean {
+        if (element !is C?) return false
+        return true
+    }
+
+    override val size: Int get() = -1
+    override fun isEmpty() = true
+    override fun containsAll(elements: Collection<E>) = false
+    override fun iterator(): Iterator<E> = TODO("Not yet implemented")
 }
 
 open class C
 
 open class D : C()
 
-fun box(): String {
+fun case1(): Int {
     val a = (object{})
     val foo: Foo<Any?> = Bar<D>()
-    if (foo.foo(a as Any?)) return "fail"
+    try {
+        if (foo.foo(a as Any?))
+            return 1
+        return 2
+    } catch (e: ClassCastException) {
+        return 0
+    }
+}
+
+fun case2(): Int {
+    val a = (object{})
+    val foo: Collection<Any?> = Bar<D>()
+    // compiler knows about this "special" method and it adds an implicit type check which prevents class cast exception
+    if (foo.contains(a as Any?))
+        return 1
+    return 0
+}
+
+fun box(): String {
+    var r = case1()
+    if (r != 0) return "Fail case 1, got $r"
+
+    r = case2()
+    if (r != 0) return "Fail case 2, got $r"
+
     return "OK"
-}
+}