[JITLink][LoongArch] Support R_LARCH_ALIGN relaxation (#122259) Linker relaxation is not implemented for jitlink now. But if relaxation is enabled by clang, R_LARCH_RELAX and R_LARCH_ALIGN relocations will be emitted. This commit adapts lld's algorithm to jitlink. Currently, only relaxing R_LARCH_ALIGN is implemented. Other relaxable relocs can be implemented in the future. Without this, interpreting C++ code using clang-repl or running ir using lli when relaxation is enabled will occur error: `JIT session error: Unsupported loongarch relocation:102: R_LARCH_ALIGN`. Similar to https://github.com/llvm/llvm-project/commit/310473c536dd4837934832d1b5454d212f15d5cc but only implement align.
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