[lld][LoongArch] Support reloc types for LA32R/LA32S (#172618)
This patch adds support for processing the relocation types introduced
in la-abi-specs v2.50.
Link: https://github.com/loongson/la-abi-specs/pull/16
Link:
https://sourceware.org/pipermail/binutils/2025-December/146091.html