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/tools/llvm-readobj/llvm-readobj.cpp b/llvm/tools/llvm-readobj/llvm-readobj.cpp
index 837b71f..6e5b835 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ b/llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -292,11 +292,11 @@
     reportError(File, EC);
     return;
   }
-  std::unique_ptr<Binary> Binary = std::move(BinaryOrErr.get());
+  Binary &Binary = *BinaryOrErr.get();
 
-  if (Archive *Arc = dyn_cast<Archive>(Binary.get()))
+  if (Archive *Arc = dyn_cast<Archive>(&Binary))
     dumpArchive(Arc);
-  else if (ObjectFile *Obj = dyn_cast<ObjectFile>(Binary.get()))
+  else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
     dumpObject(Obj);
   else
     reportError(File, readobj_error::unrecognized_file_format);