C++: Do type and name equality checking in a safe manner.

Change the TypeMatcher to also match names, and use two "block" lists
in SafeMatcher to prevent infinite recursion.

Task-number: QTCREATORBUG-11240
Change-Id: I0367ae795ee6be579b83aeb8d46723c877e4aa75
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/cplusplus/AlreadyConsideredClassContainer.h

@@ -1,6 +1,8 @@
 #ifndef CPLUSPLUS_ALREADYCONSIDEREDCLASSCONTAINER_H
 #define CPLUSPLUS_ALREADYCONSIDEREDCLASSCONTAINER_H
 
+#include <cplusplus/SafeMatcher.h>
+
 #include <QSet>
 
 namespace CPlusPlus {
@@ -21,8 +23,9 @@ public:
         if (_container.contains(item))
             return true;
 
+        SafeMatcher matcher;
         foreach (const T *existingItem, _container) {
-            if (existingItem->isEqualTo(item))
+            if (Matcher::match(existingItem, item, &matcher))
                 return true;
         }