[llvm] AArch64: Base MCAsmInfo type on binary format before OS (PR #147875)

[Matt Arsenault via llvm-commits]

arsenm wrote:

### Merge activity

* **Jul 10, 4:04 AM UTC**: A user started a stack merge that includes this pull request via [Graphite](https://app.graphite.dev/github/pr/llvm/llvm-project/147875).


https://github.com/llvm/llvm-project/pull/147875