[lld] [LLD][LoongArch] Preserve R_LARCH_MARK_LA with --emit-relocs (PR #192033)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Can you elaborate why you need R_LARCH_MARK_LA? It does nothing in lld/ELF. RISC-V doesn't need such a marker relocation.

https://github.com/llvm/llvm-project/pull/192033