Update clang to r339409.

Change-Id: I800772d2d838223be1f6b40d490c4591b937fca2
diff --git a/linux-x64/clang/include/llvm/Support/StringSaver.h b/linux-x64/clang/include/llvm/Support/StringSaver.h
index e85b289..6b77d48 100644
--- a/linux-x64/clang/include/llvm/Support/StringSaver.h
+++ b/linux-x64/clang/include/llvm/Support/StringSaver.h
@@ -10,23 +10,49 @@
 #ifndef LLVM_SUPPORT_STRINGSAVER_H
 #define LLVM_SUPPORT_STRINGSAVER_H
 
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/Allocator.h"
 
 namespace llvm {
 
-/// \brief Saves strings in the inheritor's stable storage and returns a
+/// Saves strings in the provided stable storage and returns a
 /// StringRef with a stable character pointer.
 class StringSaver final {
   BumpPtrAllocator &Alloc;
 
 public:
   StringSaver(BumpPtrAllocator &Alloc) : Alloc(Alloc) {}
+
+  // All returned strings are null-terminated: *save(S).end() == 0.
   StringRef save(const char *S) { return save(StringRef(S)); }
   StringRef save(StringRef S);
   StringRef save(const Twine &S) { return save(StringRef(S.str())); }
   StringRef save(const std::string &S) { return save(StringRef(S)); }
 };
+
+/// Saves strings in the provided stable storage and returns a StringRef with a
+/// stable character pointer. Saving the same string yields the same StringRef.
+///
+/// Compared to StringSaver, it does more work but avoids saving the same string
+/// multiple times.
+///
+/// Compared to StringPool, it performs fewer allocations but doesn't support
+/// refcounting/deletion.
+class UniqueStringSaver final {
+  StringSaver Strings;
+  llvm::DenseSet<llvm::StringRef> Unique;
+
+public:
+  UniqueStringSaver(BumpPtrAllocator &Alloc) : Strings(Alloc) {}
+
+  // All returned strings are null-terminated: *save(S).end() == 0.
+  StringRef save(const char *S) { return save(StringRef(S)); }
+  StringRef save(StringRef S);
+  StringRef save(const Twine &S) { return save(StringRef(S.str())); }
+  StringRef save(const std::string &S) { return save(StringRef(S)); }
+};
+
 }
 #endif