[Backport][LoongArch] Support `relax` feature on LoongArch in llvm17 · Pull Request !47 · openEuler/llvm-project

Backport from llvmorg。补丁对应在github上的合入链接如下：
[1]: [lld][LoongArch] Support the R_LARCH_{ADD,SUB}6 relocation type (#72190)
https://github.com/llvm/llvm-project/pull/72190
[2]: [LoongArch] Add relax feature and keep relocations (#72191)
https://github.com/llvm/llvm-project/pull/72191
[3]: [LoongArch] Allow delayed decision for ADD/SUB relocations (#72960)
https://github.com/llvm/llvm-project/pull/72960
[4]: [LoongArch] Emit R_LARCH_RELAX when expanding some LoadAddress (#72961)
https://github.com/llvm/llvm-project/pull/72961
[5]: [MC][LoongArch] Add AlignFragment size if layout is available and not need insert nops (#76552)
https://github.com/llvm/llvm-project/pull/76552
[6]: [LoongArch][RISCV] Support R_LARCH_{ADD,SUB}_ULEB128/R_RISCV_{SET,SUB}_ULEB128 for .uleb128 directives
https://github.com/llvm/llvm-project/pull/76433
https://reviews.llvm.org/D157657
https://github.com/llvm/llvm-project/commit/d7398a355461b3a9f1685b0d2bf42c157b159e8f
[7]: [LoongArch] Add relaxDwarfLineAddr and relaxDwarfCFA to handle the mutable label diff in dwarfinfo (#77728)
https://github.com/llvm/llvm-project/pull/77728
[8]: [LoongArch] Insert nops and emit align reloc when handle alignment directive (#72962)
https://github.com/llvm/llvm-project/pull/72962
[9]: [ELF][RISCV] Implement --emit-relocs with relaxation
https://reviews.llvm.org/D159082
[10]: [lld][ELF] Support relax R_LARCH_ALIGN (#78692)
https://github.com/llvm/llvm-project/pull/78692
[11]: [test] Update dwarf-loongarch-relocs.ll
https://github.com/sailfishos-mirror/llvm-project/commit/baba7e4175b6ca21e83b1cf8229f29dbba02e979
[12]: [lld][LoongArch] Support the R_LARCH_{ADD,SUB}_ULEB128 relocation types (#81133)
https://github.com/llvm/llvm-project/pull/81133
[13]: [MC][test] Change ELF/uleb-ehtable.s Mach-O to use private symbols in .uleb128 for label differences
https://github.com/llvm/llvm-project/commit/0a89bda4a8b756a00985e0965f7686b5ceb43295
[14]: [Mips][MC] AttemptToFoldSymbolOffsetDifference: revert isMicroMips special case
https://reviews.llvm.org/D157655

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