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

[David Salinas via cfe-commits]

david-salinas wrote:

@nikic  I see you added a commit to change the Clang Driver code, but do the clang-offload-bundler tests actually fail on s390?  If they're not failing, either we don't need that change, or the existing tests are missing coverage and we do need the change.

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