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6c54ab548f
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)