[llvm] [AArch64][CodeGen] Fix crash when fptrunc returns fp16 with +nofp attr (PR #81724)

[David Green via llvm-commits]

davemgreen wrote:

> This effectively includes my PR #80576, which is ready to merge except for an unresolved question about where and how to document the change. If I can get some guidance on what documentation is wanted there, I can amend that, push it, so that when we then rebase this one, it shows fewer changes?

Oh I thought I had seen a patch like that, but didn't manage to find it in a quick search - only the Arm parts and the generic part, both of which I think have been committed. Thanks for the info, we can try and get that one in.

https://github.com/llvm/llvm-project/pull/81724