[llvm] [AArch64, ELF] Omit initial $d of non-text sections (PR #99580)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> Although this mix-and-match scenario is unlikely to affect any users except those doing OMAGIC style things, if we have even slight reservations, perhaps this PR could be adjusted to use EMS_Data for non-SHF_ALLOC sections as an extra safety measure.

(More write-up here https://maskray.me/blog/2024-07-21-mapping-symbols-rethinking-for-efficiency)

@TNorthover In https://reviews.llvm.org/D30724 for AArch32 , one suggestions was that we could omit mapping symbols non-SHF_ALLOC but you did not think so.

I know that linker scripts can do strange things like blending data and code, but I think it's fairly safe to assume that non-SHF_ALLOC sections cannot contain instructions.

https://github.com/llvm/llvm-project/pull/99580