[clang] [llvm] [MC,llvm-readobj,yaml2obj] Support CREL relocation format (PR #91280)

[James Henderson via cfe-commits]

https://github.com/jh7370 commented:

I've made a start on this, but have run out of time. Will come back to reviewing it another day.

https://github.com/llvm/llvm-project/pull/91280