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

[David Green via llvm-commits]

davemgreen wrote:

Thanks. This looks good to me now. One last thing, can you uncomment the @f16_return test from strictfp_f16_abi_promote.ll, so that we test the strict-fp case too?

With that this LGTM if @ostannard doesn't disagree.

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