Index: lib/Basic/FileManager.cpp
===================================================================
--- lib/Basic/FileManager.cpp
+++ lib/Basic/FileManager.cpp
@@ -267,6 +267,9 @@
   if (UFE.File) {
     if (auto PathName = UFE.File->getName())
       fillRealPathName(&UFE, *PathName);
+  } else if (!openFile) {
+    // We should still fill the path even if we aren't opening the file.
+    fillRealPathName(&UFE, InterndFileName);
   }
   return &UFE;
 }
Index: unittests/Basic/FileManagerTest.cpp
===================================================================
--- unittests/Basic/FileManagerTest.cpp
+++ unittests/Basic/FileManagerTest.cpp
@@ -346,4 +346,18 @@
   EXPECT_EQ(file->tryGetRealPathName(), ExpectedResult);
 }
 
+TEST_F(FileManagerTest, getFileDontOpenRealPath) {
+  auto statCache = llvm::make_unique<FakeStatCache>();
+  statCache->InjectDirectory("/tmp/abc", 42);
+  SmallString<64> Path("/tmp/abc/foo.cpp");
+  statCache->InjectFile(Path.str().str().c_str(), 43);
+  manager.setStatCache(std::move(statCache));
+
+  const FileEntry *file = manager.getFile(Path, /*openFile=*/false);
+
+  ASSERT_TRUE(file != nullptr);
+
+  ASSERT_EQ(file->tryGetRealPathName(), Path);
+}
+
 } // anonymous namespace