Clang: Fix CodeCompletionsExtractor.BriefComment test

Change-Id: Ic01f3c361a5c81cfb96c51d6111ed6d589a76563
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

tests/unit/unittest/codecompletionsextractortest.cpp

@@ -660,6 +660,7 @@ TEST_F(CodeCompletionsExtractor, CompletionChunksClass)
 
 TEST_F(CodeCompletionsExtractor, BriefComment)
 {
+    briefCommentTranslationUnit.reparse();
     ClangCodeCompleteResults completeResults(getResults(briefCommentTranslationUnit, 10));
 
     ::CodeCompletionsExtractor extractor(completeResults.data());