Clang: Reindex without PCHs if error are occurring

If an occurs we first reindex with the system PCH only and if it is still
occurring we are indexing without any PCH.

Task-number: QTCREATORBUG-22011
Change-Id: I815ee3abe7829aaeb191d985cd045bac35015893
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

tests/unit/unittest/gtest-creator-printing.cpp

@@ -39,27 +39,28 @@
 #include <clangpathwatcher.h>
 #include <clangrefactoringmessages.h>
 #include <clangreferencescollector.h>
-#include <filestatus.h>
 #include <filepath.h>
 #include <filepathcaching.h>
+#include <filepathview.h>
+#include <filestatus.h>
 #include <fulltokeninfo.h>
 #include <includesearchpath.h>
 #include <nativefilepath.h>
+#include <pchpaths.h>
 #include <pchtask.h>
 #include <precompiledheadersupdatedmessage.h>
 #include <projectpartartefact.h>
+#include <projectpartentry.h>
 #include <projectpartid.h>
 #include <sourcedependency.h>
 #include <sourcelocationentry.h>
 #include <sourcelocationscontainer.h>
-#include <tokenprocessor.h>
-#include <filepathview.h>
+#include <symbol.h>
 #include <symbolentry.h>
 #include <symbolindexertaskqueue.h>
-#include <symbol.h>
-#include <tooltipinfo.h>
+#include <tokenprocessor.h>
 #include <toolchainargumentscache.h>
-#include <projectpartentry.h>
+#include <tooltipinfo.h>
 #include <usedmacro.h>
 
 #include <cpptools/usages.h>
@@ -1289,6 +1290,10 @@ std::ostream &operator<<(std::ostream &out, const ProjectPartId &projectPathId)
     return out << projectPathId.projectPathId;
 }
 
+std::ostream &operator<<(std::ostream &out, const PchPaths &pchPaths)
+{
+    return out << "(" << pchPaths.projectPchPath << ", " << pchPaths.systemPchPath << ")";
+}
 void PrintTo(const FilePath &filePath, ::std::ostream *os)
 {
     *os << filePath;