[lld] [lld][AArch64] Fix getImplicitAddend in big-endian mode. (PR #107845)

[Peter Smith via llvm-commits]

smithp35 wrote:

To trigger the problem it would need big-endian objects from an assembler that uses REL format relocations [*] which is a niche on top of a niche. While it would be a safe backport I'm not sure it qualifies as a critical fix (per https://discourse.llvm.org/t/llvm-19-1-0-rc4-released/81039) 
 
[*] Arm's armasm assembler is the only tool that I know of that does this.



https://github.com/llvm/llvm-project/pull/107845