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

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Some inline comments.

P.S. Please use fixup commits, not force pushes, per LLVM policy, to update the PR now that I'm reviewing it.

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