Add labels for extension properties

#KT-2824 Fixed

compiler/testData/codegen/label/propertyAccessor.kt

@@ -0,0 +1,29 @@
+val Int.getter: Int
+    get() {
+        return this@getter
+    }
+
+var Int.setter1: Int = 2
+    get() {
+        return this@setter1
+    }
+    set(i: Int) {
+        $setter1 = this@setter1
+    }
+
+var Int.setter2: Int = 2
+    set(i: Int) {
+        $setter2 = this@setter2
+    }
+
+fun box(): String {
+    val i = 1
+    if (i.getter != 1) return "getter failed"
+
+    i.setter1 = 2
+    if (i.setter1 != 1) return "setter1 failed"
+    i.setter2 = 2
+    if (i.setter2 != 1) return "setter2 failed"
+
+    return "OK"
+}

compiler/testData/codegen/label/propertyAccessorFunctionLiteral.kt

@@ -0,0 +1,23 @@
+val Int.getter: Int
+    get() {
+        return {
+            this@getter
+        }.invoke()
+    }
+
+var Int.setter: Int = 1
+    set(i: Int) {
+        $setter = {
+            this@setter
+        }.invoke()
+    }
+
+fun box(): String {
+    val i = 1
+    if (i.getter != 1) return "getter failed"
+
+    i.setter = 2
+    if (i.setter != 1) return "setter failed"
+
+    return "OK"
+}

compiler/testData/codegen/label/propertyAccessorInnerExtensionFun.kt

@@ -0,0 +1,27 @@
+val Int.getter: Int
+    get() {
+        val extFun = { Int.() ->
+            this@getter
+        }
+        return this@getter.extFun()
+    }
+
+
+var Int.setter: Int = 1
+    set(i: Int) {
+        val extFun = { Int.() ->
+            this@setter
+        }
+        this@setter.extFun()
+    }
+
+
+fun box(): String {
+    val i = 1
+    if (i.getter != 1) return "getter failed"
+
+    i.setter = 1
+    if (i.setter != 1) return "setter failed"
+
+    return "OK"
+}

compiler/testData/codegen/label/propertyAccessorObject.kt

@@ -0,0 +1,53 @@
+trait Base {
+    fun foo(): Int
+}
+
+val Int.getter: Int
+    get() {
+        return object: Base {
+            override fun foo(): Int {
+                return this@getter
+            }
+        }.foo()
+    }
+
+var Int.setter1: Int = 2
+    set(i: Int) {
+        $setter1 = object: Base {
+            override fun foo(): Int {
+                this@setter1
+                return 1
+            }
+        }.foo()
+    }
+
+
+var Int.setter2: Int = 2
+    get() {
+        return object: Base {
+            override fun foo(): Int {
+                return this@setter2
+            }
+        }.foo()
+    }
+    set(i: Int) {
+        $setter2 = object: Base {
+            override fun foo(): Int {
+                this@setter2
+                return 1
+            }
+        }.foo()
+    }
+
+
+fun box(): String {
+    val i = 1
+    if (i.getter != 1) return "getter failed"
+
+    i.setter1 = 2
+    if (i.setter1 != 1) return "setter1 failed"
+    i.setter2 = 2
+    if (i.setter2 != 1) return "setter2 failed"
+
+    return "OK"
+}

compiler/testData/codegen/label/propertyInClassAccessor.kt

@@ -0,0 +1,17 @@
+class Test {
+    val Int.innerGetter: Int
+        get() {
+            return this@innerGetter
+        }
+
+    fun test(): Int {
+        val i = 1
+        if (i.innerGetter != 1) return 0
+        return 1
+    }
+}
+
+fun box(): String {
+    if (Test().test() != 1) return "inner getter or setter failed"
+    return "OK"
+}