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6c54ab54 - [lld][LoongArch] Relax R_LARCH_{PCALA,GOT_PC}_{HI20,LO12} (#123566)

[lld][LoongArch] Relax R_LARCH_{PCALA,GOT_PC}_{HI20,LO12} (#123566) Support relaxation optimization for two types of code sequences. ``` From: pcalau12i $a0, %pc_hi20(sym) R_LARCH_PCALA_HI20, R_LARCH_RELAX addi.w/d $a0, $a0, %pc_lo12(sym) R_LARCH_PCALA_LO12, R_LARCH_RELAX To: pcaddi $a0, %pc_lo12(sym) R_LARCH_PCREL20_S2 From: pcalau12i $a0, %got_pc_hi20(sym_got) R_LARCH_GOT_PC_HI20, R_LARCH_RELAX ld.w/d $a0, $a0, %got_pc_lo12(sym_got) R_LARCH_GOT_PC_LO12, R_LARCH_RELAX To: pcaddi $a0, %got_pc_hi20(sym_got) R_LARCH_PCREL20_S2 ``` Others: - `loongarch-relax-pc-hi20-lo12-got-symbols.s` is inspired by `aarch64-adrp-ldr-got-symbols.s`. Co-authored-by: Xin Wang [wangxin03@loongson.cn](mailto:wangxin03@loongson.cn)