[ELF] Rename target-specific RelExpr enumerators RelExpr enumerators are named `R_*`, which can be confused with ELF relocation type names. Rename the target-specific ones to `RE_*` to avoid confusion. For consistency, the target-independent ones can be renamed as well, but that's not urgent. The relocation processing mechanism with RelExpr has non-trivial overhead compared with mold's approach, and we might make more code into Arch/*.cpp files and decrease the enumerators. Pull Request: https://github.com/llvm/llvm-project/pull/118424
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