KT-2866 Names from multi-declarations do not show up in completion

Test added
 #KT-2866 Fixed

idea/testData/completion/basic/LocalMultideclarationValues.kt

@@ -0,0 +1,10 @@
+data class TestData(val first: Int, val second: String)
+
+fun f() : TestData = TestData(42, "Second")
+
+fun test() {
+  val (dataFirst, dataSecond) = f()
+  d<caret>
+}
+
+// EXIST: dataFirst, dataSecond