[llvm] [llvm-objdump] Add preliminary support for decoding binary files (PR #115667)

[Fangrui Song via llvm-commits]

MaskRay wrote:

BinaryObjectFile.cpp:40 has an unchecked `Error Err`, leading to a failure in a LLVM_ENABLE_ASSERTIONS=on build (default for debug).
https://llvm.org/docs/ProgrammersManual.html#recoverable-errors#:~:text=either%20checked

https://github.com/llvm/llvm-project/pull/115667