[LoongArch] Use FirstRelocationKind to remove ELFObjectWriter::recordRelocation special case

The current implementation of R_LARCH_SUB{8,16,32,64} and TLS relocation types relies on fixup kinds FirstLiteralRelocationKind + offset (originally intended for .reloc directives). While this is clever and prevents switch cases like

```
case fixup_...sub8:
  return ELF::R_LARCH_SUB8;
```

it needs revision.

GNU Assembler treats .reloc directives differently from standard relocations, notably by skipping

* Skipping STT_SECTION adjustments (when a referenced symbol is local and satisfies certain conditions, it can be redirected to a section symbol).
* Skipping STT_TLS symbol type setting for TLS relocations.

Encode relocatin type t with FirstRelocationKind+t instead of
FirstLiteralRelocationKind+t. The new value is less than
FirstLiteralRelocationKind and will not be treated as a .reloc
directive.

Close #135521

0 files changed, 0 insertions, 0 deletions