C++: Store lambda captures in the code model.

Done-with: Erik Verbruggen
Task-number: QTCREATORBUG-7968
Task-number: QTCREATORBUG-7949

Change-Id: I0cf727052d0a3536ed96ee894b18768c9538c213
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/cpplocalsymbols.cpp

@@ -127,6 +127,11 @@ protected:
         return true;
     }
 
+    virtual bool visit(CaptureAST *ast)
+    {
+        return checkLocalUse(ast->identifier, ast->firstToken());
+    }
+
     virtual bool visit(IdExpressionAST *ast)
     {
         return checkLocalUse(ast->name, ast->firstToken());