[llvm] [MC][Aarch32][Assembly] Emit relocs for LDRs (PR #72873)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Thank you for including tags in the title (always useful for us folks on buildbot duty), but might I suggest they be this instead:
```
[llvm][MC][ARM] ...
```
Since llvm is a subproject of the monorepo (albeit the key one) and `ARM` is the equivalent name for `AArch32` in llvm.

https://github.com/llvm/llvm-project/pull/72873