Generate bridges for fake overrides when needed

#KT-3985 Fixed
 #KT-4145 Fixed

compiler/testData/codegen/box/bridges/fakeOverrideWithSeveralSuperDeclarations.kt

@@ -0,0 +1,25 @@
+trait D1 {
+    fun foo(): Any
+}
+
+trait D2 {
+    fun foo(): Number
+}
+
+trait F3 : D1, D2
+
+open class D4 {
+    fun foo(): Int = 42
+}
+
+class F5 : F3, D4()
+
+fun box(): String {
+    val z = F5()
+    var result = z.foo()
+    result += (z : D4).foo()
+    result += (z : F3).foo() as Int
+    result += (z : D2).foo() as Int
+    result += (z : D1).foo() as Int
+    return if (result == 5 * 42) "OK" else "Fail: $result"
+}