Support for callable references in smart completion

idea/idea-completion/testData/smart/callableReference/NonEmptyQualifier2.kt

@@ -0,0 +1,15 @@
+import kotlin.reflect.KProperty1
+
+fun foo(p: KProperty1<String, Int>){}
+
+fun bar() {
+    foo(String::xT<caret>)
+}
+
+val String.xTopLevelIntVal: Int get()  = 1
+val String.xTopLevelStringVal: String get() = "1"
+val Any.xTopLevelValOnAny: Int get()  = 1
+val Int.xTopLevelValOnInt: Int get()  = 1
+
+// EXIST: { lookupString:"xTopLevelIntVal", itemText:"xTopLevelIntVal", tailText: " for String in <root>", typeText: "Int" }
+// NOTHING_ELSE