[llvm] [llvm][ARM] Correct the properties of trap instructions (PR #113287)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

(It looks like this was discovered before in https://reviews.llvm.org/D53614, but it wasn't fixed at the time for some reason.)

https://github.com/llvm/llvm-project/pull/113287