[compiler-rt] compiler-rt: Make the tests pass on AArch64 and with page size != 4096. (PR #153860)

[Peter Collingbourne via llvm-commits]

pcc wrote:

Pushed manually, `spr land` was giving me an error for some reason
```
ac2ae3e compiler-rt: Make the tests pass on AArch64 and with page size != 4096.
  #️⃣   Pull Request #153860
  🛫  Getting started...
  ❌  GitHub Pull Request merge failed
  🛑  GitHub: Unable to determine if workflow can be created or updated due to timeout; `workflows` scope may be
      required.
      Documentation URL: https://docs.github.com/rest/pulls/pulls#merge-a-pull-request
```

https://github.com/llvm/llvm-project/pull/153860