clang-native-arm-cortex-a9

[Tim Northover]

> Meanwhile, Tim, those were your tests that just happened to fail
> recently, can you spot anything wrong with them?
>
> http://lab.llvm.org:8011/builders/clang-native-arm-cortex-a15/builds/2235/steps/check-all/logs/LLVM%3A%3Amacho-compact-unwind-i386.test

Oh, bother. I'll see what I can do. Probably some kind of undefined
behaviour giving a random address by the looks of it.

Cheers.

Tim.