Clang: Offer snippets in completion

Change-Id: I3d0cce5d408d11998aec024b23d9a218a75df3a3
Task-number: QTCREATORBUG-12935
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/clangcodemodel/clangcompletion.cpp

@@ -1061,6 +1061,8 @@ int ClangCompletionAssistProcessor::startCompletionInternal(const QString fileNa
     foreach (ClangAssistProposalItem *item, items.values())
         m_completions.append(item);
 
+    addSnippets();
+
     return m_startPosition;
 }