[llvm-branch-commits] [LoongArch] Generate more PCRel relocations for resolvable sub-symbols (PR #211754)

[via llvm-branch-commits]

https://github.com/wangleiat created https://github.com/llvm/llvm-project/pull/211754

Use PC-relative relocations when the sub-symbol offset can be resolved
during assembly, avoiding ADD/SUB relocation pairs.