Data Inflow: Support delegated assignments

#KT-19089 Fixed

idea/testData/slicer/inflow/settersViaDelegateForQualifiedRef.kt

@@ -0,0 +1,26 @@
+// FLOW: IN
+
+class Delegate {
+    private var _value: String = ""
+    operator fun getValue(thisRef: Any?, property: KProperty<*>) = _value
+    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
+        _value = value
+    }
+}
+
+class AClass(name1: String){
+    var name by Delegate()
+    init {
+        name = name1
+    }
+
+    fun uses(){
+        name = "bye"
+        println("Now my name is '$name'")
+    }
+}
+
+fun main(args: Array<String>) {
+    val a = AClass("hello")
+    println("My name is '${a.<caret>name}'")
+}

idea/testData/slicer/inflow/settersViaDelegateForQualifiedRef.results.txt

@@ -0,0 +1,12 @@
+25 println("My name is '${a.<bold>name</bold>}'")
+12 	var <bold>name by Delegate()</bold>
+5 		operator fun <bold>getValue(thisRef: Any?, property: KProperty<*>) = _value</bold>
+5 			operator fun getValue(thisRef: Any?, property: KProperty<*>) = <bold>_value</bold>
+4 				private var <bold>_value: String = ""</bold>
+4 					private var _value: String = <bold>""</bold>
+7 					_value = <bold>value</bold>
+6 						operator fun setValue(thisRef: Any?, property: KProperty<*>, <bold>value: String</bold>) {
+14 							name = <bold>name1</bold>
+11 								class AClass(<bold>name1: String</bold>){
+24 									val a = AClass(<bold>"hello"</bold>)
+18 							name = <bold>"bye"</bold>

idea/testData/slicer/inflow/settersViaDelegateForSimpleRef.kt

@@ -0,0 +1,26 @@
+// FLOW: IN
+
+class Delegate {
+    private var _value: String = ""
+    operator fun getValue(thisRef: Any?, property: KProperty<*>) = _value
+    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
+        _value = value
+    }
+}
+
+class AClass(name1: String){
+    var name by Delegate()
+    init {
+        name = name1
+    }
+
+    fun uses(){
+        name = "bye"
+        println("Now my name is '$<caret>name'")
+    }
+}
+
+fun main(args: Array<String>) {
+    val a = AClass("hello")
+    println("My name is '${a.name}'")
+}

idea/testData/slicer/inflow/settersViaDelegateForSimpleRef.results.txt

@@ -0,0 +1,12 @@
+19 println("Now my name is '$<bold>name</bold>'")
+12 	var <bold>name by Delegate()</bold>
+5 		operator fun <bold>getValue(thisRef: Any?, property: KProperty<*>) = _value</bold>
+5 			operator fun getValue(thisRef: Any?, property: KProperty<*>) = <bold>_value</bold>
+4 				private var <bold>_value: String = ""</bold>
+4 					private var _value: String = <bold>""</bold>
+7 					_value = <bold>value</bold>
+6 						operator fun setValue(thisRef: Any?, property: KProperty<*>, <bold>value: String</bold>) {
+14 							name = <bold>name1</bold>
+11 								class AClass(<bold>name1: String</bold>){
+24 									val a = AClass(<bold>"hello"</bold>)
+18 							name = <bold>"bye"</bold>