[llvm] AArch64: Clear hasSideEffects on AUT and AUTPAC. (PR #141330)

[David Green via llvm-commits]

davemgreen wrote:

I feel I would expect these instructions to have side-effects, especially with FPAC. Can you give more details about what kind of optimization this enables and why it is safe? I guess you mean that we do not expect the exception to occur, and if it does it does not matter where it happens, only that it does?

https://github.com/llvm/llvm-project/pull/141330