[llvm] [AArch64] Fix buildbot breakage of ubsan (PR #106065)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

I hadn't realised that 33190490c667aaf8b08d5af8b8ce84524f856e80 was not reverted with 43ffe2eed0d9f73789dbe213023733d164999306. They likely had the same bug and it would have been better to commit them as a single commit so that they were reverted together.

Nice job finding the bug though. If there are more problems make sure both patches get reverted, but this patch LGTM.

https://github.com/llvm/llvm-project/pull/106065