C++: Recognize C++11 nullptr

Change-Id: I5b7ac8f9b2137ffe9439ada4ec4aeb9cee8e249d
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/3rdparty/cplusplus/ASTPatternBuilder.h

@@ -721,6 +721,12 @@ public:
         return __ast;
     }
 
+    PointerLiteralAST *PointerLiteral()
+    {
+        PointerLiteralAST *__ast = new (&pool) PointerLiteralAST;
+        return __ast;
+    }
+
     NumericLiteralAST *NumericLiteral()
     {
         NumericLiteralAST *__ast = new (&pool) NumericLiteralAST;