Add enumeration support. (#128)

* Add enumeration support.

* Enum classes lowering.

* merge fix

* merge fix

* used arrayOf from irModule

* changed lowering quant from body to file

* refactoring

* review fixes

* lowering for GET_OBJECT in enums

* enabled tests

* added tests

* moved tests to separate dir

* renamed test files

* moved phase up

* review fixes

* reformat

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

@@ -0,0 +1,24 @@
+enum class Game {
+    ROCK,
+    PAPER,
+    SCISSORS;
+
+    companion object {
+        fun foo() = ROCK
+        val bar = PAPER
+        val values2 = values()
+        val scissors = valueOf("SCISSORS")
+    }
+}
+
+fun box(): String {
+    if (Game.foo() != Game.ROCK) return "Fail 1"
+    if (Game.bar != Game.PAPER) return "Fail 2: ${Game.bar}"
+    if (Game.values().size != 3) return "Fail 3"
+    if (Game.valueOf("SCISSORS") != Game.SCISSORS) return "Fail 4"
+    if (Game.values2.size != 3) return "Fail 5"
+    if (Game.scissors != Game.SCISSORS) return "Fail 6"
+    return "OK"
+}
+
+fun main(args: Array<String>) = println(box())

backend.native/tests/codegen/enum/test0.kt

@@ -0,0 +1,9 @@
+val TOP_LEVEL = 5
+
+enum class MyEnum(value: Int) {
+    VALUE(TOP_LEVEL)
+}
+
+fun main(args: Array<String>) {
+    println(MyEnum.VALUE.toString())
+}

backend.native/tests/codegen/enum/test1.kt

@@ -0,0 +1,8 @@
+enum class Zzz(val zzz: String, val x: Int) {
+    Z1("z1", 1),
+    Z2("z2", 2)
+}
+
+fun main(args: Array<String>) {
+    println(Zzz.Z1.zzz + Zzz.Z2.x)
+}

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

@@ -0,0 +1,13 @@
+enum class Zzz(val zzz: String, val x: Int) {
+    Z1("z1", 1),
+    Z2("z2", 2),
+    Z3("z3", 3);
+
+    override fun toString(): String{
+        return "('$zzz', $x)"
+    }
+}
+
+fun main(args: Array<String>) {
+    println(Zzz.Z3.toString())
+}

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

@@ -0,0 +1,15 @@
+enum class Zzz {
+    Z1 {
+        override fun f() = "z1"
+    },
+
+    Z2 {
+        override fun f() = "z2"
+    };
+
+    open fun f() = ""
+}
+
+fun main(args: Array<String>) {
+    println(Zzz.Z1.f() + Zzz.Z2.f())
+}

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

@@ -0,0 +1,8 @@
+enum class E {
+    E1,
+    E2
+}
+
+fun main(args: Array<String>) {
+    println(E.valueOf("E1").toString())
+}

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

@@ -0,0 +1,8 @@
+enum class E {
+    E1,
+    E2
+}
+
+fun main(args: Array<String>) {
+    println(E.values()[1].toString())
+}