[llvm] [Object] Fix offload bundle decompression on big endian (PR #205822)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 commented:

I thought this is why we generated tests via `yaml2obj` instead of shipping static objects. These bundles are generally expected to be tied to the machine's endianness, since they get embedded in ELF files and similar. Long term I wish we could delete the offload binary format entirely.

https://github.com/llvm/llvm-project/pull/205822