Improve inference on generics for callable references

#KT-10711 Fixed
 #KT-12802 Fixed
 #KT-12964 Fixed
 #KT-15439 Fixed

Analyze callable references in `dependent` mode, then complete them with
respect to expected types

compiler/testData/diagnostics/tests/callableReference/kt15439_completeCall.kt

@@ -0,0 +1,11 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE, -UNUSED_VARIABLE
+
+fun test() {
+    data class Pair<F, S>(val first: F, val second: S)
+    val (x, y) =
+            Pair(1,
+                 if (1 == 1)
+                     Pair<String, String>::first
+                 else
+                     Pair<String, String>::second)
+}