diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index cf02675..93715d8 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -161,7 +161,7 @@
 
   StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
   FileManager &FileMgr = CI.getFileManager();
-  const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude);
+  auto PCHDir = FileMgr.getDirectory(PCHInclude);
   if (!PCHDir) {
     MDC->addFile(PCHInclude);
     return;
@@ -169,7 +169,7 @@
 
   std::error_code EC;
   SmallString<128> DirNative;
-  llvm::sys::path::native(PCHDir->getName(), DirNative);
+  llvm::sys::path::native((*PCHDir)->getName(), DirNative);
   llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
   SimpleASTReaderListener Validator(CI.getPreprocessor());
   for (llvm::vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
@@ -342,7 +342,7 @@
   // Remap files in the source manager (with other files).
   for (const auto &RF : InitOpts.RemappedFiles) {
     // Find the file that we're mapping to.
-    const FileEntry *ToFile = FileMgr.getFile(RF.second);
+    auto ToFile = FileMgr.getFile(RF.second);
     if (!ToFile) {
       Diags.Report(diag::err_fe_remap_missing_to_file) << RF.first << RF.second;
       continue;
@@ -350,7 +350,7 @@
 
     // Create the file entry for the file that we're mapping from.
     const FileEntry *FromFile =
-        FileMgr.getVirtualFile(RF.first, ToFile->getSize(), 0);
+        FileMgr.getVirtualFile(RF.first, (*ToFile)->getSize(), 0);
     if (!FromFile) {
       Diags.Report(diag::err_fe_remap_missing_from_file) << RF.first;
       continue;
@@ -358,7 +358,7 @@
 
     // Override the contents of the "from" file with the contents of
     // the "to" file.
-    SourceMgr.overrideFileContents(FromFile, ToFile);
+    SourceMgr.overrideFileContents(FromFile, *ToFile);
   }
 
   SourceMgr.setOverridenFilesKeepOriginalName(
@@ -558,7 +558,7 @@
                                  unsigned Column) {
   // Tell the source manager to chop off the given file at a specific
   // line and column.
-  const FileEntry *Entry = PP.getFileManager().getFile(Filename);
+  auto Entry = PP.getFileManager().getFile(Filename);
   if (!Entry) {
     PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
       << Filename;
@@ -566,7 +566,7 @@
   }
 
   // Truncate the named file at the given line/column.
-  PP.SetCodeCompletionPoint(Entry, Line, Column);
+  PP.SetCodeCompletionPoint(*Entry, Line, Column);
   return false;
 }
 
@@ -830,11 +830,12 @@
 
   // Figure out where to get and map in the main file.
   if (InputFile != "-") {
-    const FileEntry *File = FileMgr.getFile(InputFile, /*OpenFile=*/true);
-    if (!File) {
+    auto FileOrErr = FileMgr.getFile(InputFile, /*OpenFile=*/true);
+    if (!FileOrErr) {
       Diags.Report(diag::err_fe_error_reading) << InputFile;
       return false;
     }
+    auto File = *FileOrErr;
 
     // The natural SourceManager infrastructure can't currently handle named
     // pipes, but we would at least like to accept them for the main
@@ -1154,7 +1155,9 @@
     llvm::sys::path::append(PublicFilename, "module.modulemap");
   else
     return nullptr;
-  return FileMgr.getFile(PublicFilename);
+  if (auto FE = FileMgr.getFile(PublicFilename))
+    return *FE;
+  return nullptr;
 }
 
 /// Compile a module file for the given module, using the options
@@ -1718,8 +1721,9 @@
       if (Source != ModuleCache && !Module) {
         Module = PP->getHeaderSearchInfo().lookupModule(ModuleName, true,
                                                         !IsInclusionDirective);
+        auto ModuleFile = FileMgr->getFile(ModuleFileName);
         if (!Module || !Module->getASTFile() ||
-            FileMgr->getFile(ModuleFileName) != Module->getASTFile()) {
+            !ModuleFile || (*ModuleFile != Module->getASTFile())) {
           // Error out if Module does not refer to the file in the prebuilt
           // module path.
           getDiagnostics().Report(ModuleNameLoc, diag::err_module_prebuilt)