[llvm-branch-commits] [NFCI][AArch64] Replace R_AARCH64_AUTH_ABS64 addend hack (PR #171192)

[Jessica Clarke via llvm-branch-commits]

https://github.com/jrtc27 created https://github.com/llvm/llvm-project/pull/171192

Rather than trying to infer deep down in AArch64::relocate whether we
need to actually write anything or not, we should instead mark the
relocations that we no longer want so we don't actually apply them. This
is similar to how X86_64::deleteFallThruJmpInsn works, although given
the target is still valid we don't need to mess with the offset, just
the expr.