C++: improve support for anonymous classes

Fix:
* highlighting
* find usages
* follow symbol
* code completion

Task-number: QTCREATORBUG-6497
Task-number: QTCREATORBUG-8963
Task-number: QTCREATORBUG-3610
Task-number: QTCREATORBUG-7579

Change-Id: I3dcaf1c515d0199c3e6bee72284fbb40064686ee
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/libs/3rdparty/cplusplus/Names.cpp

@@ -249,3 +249,29 @@ bool SelectorNameId::isEqualTo(const Name *other) const
     return true;
 }
 
+AnonymousNameId::AnonymousNameId(unsigned classTokenIndex)
+    : _classTokenIndex(classTokenIndex)
+{ }
+
+AnonymousNameId::~AnonymousNameId()
+{ }
+
+unsigned AnonymousNameId::classTokenIndex() const
+{
+    return _classTokenIndex;
+}
+
+void AnonymousNameId::accept0(NameVisitor *visitor) const
+{ visitor->visit(this); }
+
+const Identifier *AnonymousNameId::identifier() const
+{ return 0; }
+
+bool AnonymousNameId::isEqualTo(const Name *other) const
+{
+    if (other) {
+        const AnonymousNameId *c = other->asAnonymousNameId();
+        return (c && this->_classTokenIndex == c->_classTokenIndex);
+    }
+    return false;
+}