[Clang] Fix RHEL 6 build and other Include What You Use warnings

[Eugene.Zelenko]

Summary

Build was broken because of missing climits where PATH_MAX is defined.

[mehdi_amini]

lib/Basic/FileManager.cpp

35

That's a lot of includes though. Ok for the climits, but the other should be a separate patch I think.

[Eugene.Zelenko]

But all of them are used in code. I don't see a reason to save lines :-)

[Eugene.Zelenko]

Committed as fix for build failure after llvm/ADT/DenseMap.h in r278583.

lib/Basic/FileManager.cpp

 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <climits>
+#include <cstdint>
+#include <cstdlib>
 #include <string>
+#include <utility>
 
 using namespace clang;
 

   UniqueRealFiles.erase(Entry->getUniqueID());
 }
 
-
 void FileManager::GetUniqueIDMapping(
                    SmallVectorImpl<const FileEntry *> &UIDToFiles) const {
   UIDToFiles.clear();