Revert "Resolution-based LTO API."

This reverts commit r278330.

I made a change to the save temps output that is causing issues with the
bots. Didn't realize this because I had older output files sitting on
disk in my test output directory.

llvm-svn: 278331

llvm/lib/Object/IRObjectFile.cpp

@@ -324,5 +324,5 @@ llvm::object::IRObjectFile::create(MemoryBufferRef Object,
     return EC;
 
   std::unique_ptr<Module> &M = MOrErr.get();
-  return llvm::make_unique<IRObjectFile>(BCOrErr.get(), std::move(M));
+  return llvm::make_unique<IRObjectFile>(Object, std::move(M));
 }