[ASTPrinter] Fix printing of nested typealias types and make it consistent with printing of nominal types.

This fixes several issues:
- By default parent types of alias types are not printed which results in
	- Erroneous fixits, for example when casting to 'Notification.Name' from a string, which ends up adding erroneous cast
	  as "Name(rawValue: ...)"
	- Hard to understand types in code-completion results and diagnostics
- When printing with 'fully-qualified' option typealias types are printed erroneously like this "<PARENT>.Type.<TYPEALIAS>"

The change make typealias printing same as nominal types and addresses the above.

test/Constraints/diagnostics.swift

@@ -163,7 +163,7 @@ func rdar20142523() {
 // <rdar://problem/21080030> Bad diagnostic for invalid method call in boolean expression: (_, ExpressibleByIntegerLiteral)' is not convertible to 'ExpressibleByIntegerLiteral
 func rdar21080030() {
   var s = "Hello"
-  if s.characters.count() == 0 {} // expected-error{{cannot call value of non-function type 'IndexDistance'}}{{24-26=}}
+  if s.characters.count() == 0 {} // expected-error{{cannot call value of non-function type 'String.CharacterView.IndexDistance'}}{{24-26=}}
 }
 
 // <rdar://problem/21248136> QoI: problem with return type inference mis-diagnosed as invalid arguments