set explicit receiver kind properly for calls

compiler/testData/resolvedCalls/realExamples/stringPlusInBuilders.kt

@@ -0,0 +1,44 @@
+// !CALL: +
+// !EXPLICIT_RECEIVER_KIND: RECEIVER_ARGUMENT
+// !THIS_OBJECT: Title
+// !RECEIVER_ARGUMENT: "Foo"
+
+trait Element {
+    fun render(builder: StringBuilder, indent: String)
+}
+
+class TextElement(val text: String): Element {
+    override fun render(builder: StringBuilder, indent: String): Unit = fail
+}
+
+abstract class Tag(val name: String): Element {
+    protected fun initTag<T: Element>(tag: T, init: T.() -> Unit): T = fail
+
+    override fun render(builder: StringBuilder, indent: String): Unit = fail
+}
+
+abstract class TagWithText(name: String): Tag(name) {
+    fun String.plus() {}
+}
+
+class HTML(): TagWithText("html") {
+    fun head(init: Head.() -> Unit): Head = fail
+
+}
+
+class Head(): TagWithText("head") {
+    fun title(init: Title.() -> Unit): Title = fail
+}
+
+class Title(): TagWithText("title")
+
+fun html(init: HTML.() -> Unit): HTML = fail
+
+fun result() =
+        html {
+            head {
+                title {+"Foo"}
+            }
+        }
+
+val fail: Nothing get() = throw Exception()