[llvm] [RISCV] Vendor Relocations for Xqci extension (PR #135400)

[Sam Elliott via llvm-commits]

https://github.com/lenary commented:

This has been a long time in review, so I'm probably going to merge it fairly early tomorrow (pacific time) if there are no more comments.

https://github.com/llvm/llvm-project/pull/135400