Added tests on interface calls of enum class

backend.native/tests/build.gradle

@@ -366,6 +366,16 @@ task enum_companionObject(type: RunKonanTest) {
     source = "codegen/enum/companionObject.kt"
 }
 
+task enum_interfaceCallNoEntryClass(type: RunKonanTest) {
+    goldValue = "('z3', 3)\n('z3', 3)\n"
+    source = "codegen/enum/interfaceCallNoEntryClass.kt"
+}
+
+task enum_interfaceCallWithEntryClass(type: RunKonanTest) {
+    goldValue = "z1z2\nz1z2\n"
+    source = "codegen/enum/interfaceCallWithEntryClass.kt"
+}
+
 task innerClass_simple(type: RunKonanTest) {
     goldValue = "OK\n"
     source = "codegen/innerClass/simple.kt"

backend.native/tests/codegen/enum/interfaceCallNoEntryClass.kt

@@ -0,0 +1,19 @@
+interface A {
+    fun foo(): String
+}
+
+enum class Zzz(val zzz: String, val x: Int) : A {
+    Z1("z1", 1),
+    Z2("z2", 2),
+    Z3("z3", 3);
+
+    override fun foo(): String{
+        return "('$zzz', $x)"
+    }
+}
+
+fun main(args: Array<String>) {
+    println(Zzz.Z3.foo())
+    val a: A = Zzz.Z3
+    println(a.foo())
+}

backend.native/tests/codegen/enum/interfaceCallWithEntryClass.kt

@@ -0,0 +1,22 @@
+interface A {
+    fun f(): String
+}
+
+enum class Zzz: A {
+    Z1 {
+        override fun f() = "z1"
+    },
+
+    Z2 {
+        override fun f() = "z2"
+    };
+
+    override fun f() = ""
+}
+
+fun main(args: Array<String>) {
+    println(Zzz.Z1.f() + Zzz.Z2.f())
+    val a1: A = Zzz.Z1
+    val a2: A = Zzz.Z2
+    println(a1.f() + a2.f())
+}