Index: include/clang/Basic/FileManager.h
===================================================================
--- include/clang/Basic/FileManager.h
+++ include/clang/Basic/FileManager.h
@@ -60,6 +60,7 @@
   bool IsNamedPipe;
   bool InPCH;
   bool IsValid;               // Is this \c FileEntry initialized and valid?
+  bool IsVirtual;             // Is this \c FileEntry a virtual file?
 
   /// \brief The open file, if it is owned by the \p FileEntry.
   mutable std::unique_ptr<vfs::File> File;
@@ -69,7 +70,8 @@
 
 public:
   FileEntry()
-      : UniqueID(0, 0), IsNamedPipe(false), InPCH(false), IsValid(false)
+      : UniqueID(0, 0), IsNamedPipe(false), InPCH(false), IsValid(false),
+        IsVirtual(false)
   {}
 
   // FIXME: this is here to allow putting FileEntry in std::map.  Once we have
@@ -77,12 +79,14 @@
   /// Intentionally does not copy fields that are not set in an uninitialized
   /// \c FileEntry.
   FileEntry(const FileEntry &FE) : UniqueID(FE.UniqueID),
-      IsNamedPipe(FE.IsNamedPipe), InPCH(FE.InPCH), IsValid(FE.IsValid) {
+      IsNamedPipe(FE.IsNamedPipe), InPCH(FE.InPCH), IsValid(FE.IsValid),
+      IsVirtual(FE.IsVirtual) {
     assert(!isValid() && "Cannot copy an initialized FileEntry");
   }
 
   const char *getName() const { return Name; }
   bool isValid() const { return IsValid; }
+  bool isVirtual() const { return IsVirtual; }
   off_t getSize() const { return Size; }
   unsigned getUID() const { return UID; }
   const llvm::sys::fs::UniqueID &getUniqueID() const { return UniqueID; }
Index: lib/Basic/FileManager.cpp
===================================================================
--- lib/Basic/FileManager.cpp
+++ lib/Basic/FileManager.cpp
@@ -301,6 +301,11 @@
     return &UFE;
   }
 
+  if (UFE.isVirtual()) {
+    UFE.Name = InterndFileName;
+    return &UFE;
+  }
+
   // Otherwise, we don't have this file yet, add it.
   UFE.Name    = InterndFileName;
   UFE.Size = Data.Size;
@@ -381,6 +386,7 @@
   UFE->Dir     = DirInfo;
   UFE->UID     = NextFileUID++;
   UFE->File.reset();
+  UFE->IsVirtual = true;
   return UFE;
 }