Remove some calls to std::move.

Instead of moving out the data in a ErrorOr<std::unique_ptr<Foo>>, get
a reference to it.

Thanks to David Blaikie for the suggestion.

llvm-svn: 214516
diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index 9cd1fe7..8c62ae7 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -1258,7 +1258,7 @@
            << "': " << EC.message() << '\n';
     return 2;
   }
-  std::unique_ptr<MemoryBuffer> File = std::move(FileOrErr.get());
+  std::unique_ptr<MemoryBuffer> &File = FileOrErr.get();
 
   if (File->getBufferSize() == 0) {
     errs() << "FileCheck error: '" << InputFilename << "' is empty.\n";