LoongArchAsmBackend: Simplify relaxDwarfLineAddr and remove getRelocPairForSize Instead of creating two separate fixups, create a single one. Leverage LoongArchAsmBackend::addReloc to generate ADD/SUB relocation pairs. In a future change MCFragment::setVarFixup may be restricted to a single fixup. Similar to c7500a2ec3baae1f0d7de0de94407d4bdb2e5d4d
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