[clang] [llvm] [llvm-objcopy][libObject] Add RISC-V big-endian support (PR #146913)

[James Henderson via llvm-commits]

https://github.com/jh7370 approved this pull request.

Looks good from my point of view, once the remaining formatting comments have been addressed. Probably should have a separate person with RISC-V knowledge take a look at this too though.

https://github.com/llvm/llvm-project/pull/146913